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Implantation Dip on Physique Basal Temperature Charts

An implantation dip is a one-day drop in basal physique temperature (BBT) that happens in the course of the luteal section of the menstrual cycle (about seven to 10 days after ovulation). Whereas anecdotal proof has steered that the BBT implantation dip is seen extra typically on being pregnant charts than it’s on non-pregnancy charts, an implantation dip just isn’t a assure that you simply’re pregnant.

Right here’s the best way to acknowledge an implantation dip in your BBT chart, what causes it, and what the precise odds are that you simply’re pregnant in case you see one.

What Is an Implantation Dip?

Should you’re trying up info on implantation dips, it is vital to know the fundamentals of basal physique temperature charting. Your BBT is your physique’s temperature at relaxation. It responds to modifications in your inside and exterior setting. These BBT shifts are sometimes tied to your menstrual cycle and modifications that happen throughout ovulation and being pregnant. That is why charting is completed to assist monitor an individual’s most fertile window and predict if implantation has occurred.

Components that may have an effect on your BBT embody:

  • The quantity and high quality of your sleep (together with modifications to your wake-up time)
  • Temperature modifications in your setting (each exterior and in your house, particularly your bed room)
  • Whether or not you might be utilizing hormonal contraception
  • Whether or not you’ve got a fever (and in that case, whether or not you’re taking medicine to scale back your fever)
  • Whether or not you’re preventing an sickness or an infection
  • Whether or not you have consumed alcohol
  • Your stress ranges (bodily and emotional)
  • Your hormone ranges

To know implantation dips, that you must know the way hormones have an effect on your basal physique temperature. After you ovulate, will probably be a number of tenths of a level greater. This bounce in temperature is brought on by the hormone progesterone, which will increase after ovulation.

An implantation dip is a one-day drop in temperature on a basal physique temperature chart. It happens about one week after ovulation.

Often, a dropping temperature is an indication that your interval is coming or has already arrived. Your interval shouldn’t start seven to 10 days after ovulation, which implies that you wouldn’t anticipate a temperature drop right now.

With an implantation dip, the autumn solely lasts a day—your temperature will return up the following day. That is in contrast to what occurs after your interval begins, through which case your temperature drops and stays down for a number of days.

The dip may be barely decrease than the remainder of your post-ovulation temperatures, or it might drop under the coverline in your fertility chart.


The coverline is an imaginary horizontal line in your BBT chart that separates common temperatures earlier than ovulation from common temperatures after ovulation.

The dip seems in the course of the luteal section of your cycle—the time between ovulation and your anticipated interval. Implantation of an embryo often happens between days seven and 11 of the luteal section. Due to this fact, some individuals attribute a sudden one-day dip in temperature to implantation.

What Causes an Implantation Dip?

Regardless of its identify, it isn’t clear whether or not embryo implantation does trigger a brief drop in basal physique temperature. Non-pregnancy charts also can have the dip, which might imply that the phenomenon just isn’t unique to being pregnant.

One principle is that the hormone estrogen causes the dip. Estrogen peaks twice throughout your cycle. The primary (and largest) surge happens simply earlier than ovulation and results in fertile cervical mucus and a lift in sexual want.

There’s a second surge about halfway by way of the luteal section. This surge isn’t as excessive as the primary, however it’s nonetheless important.

The hormone progesterone raises your physique temperature, whereas estrogen lowers it. The second surge in estrogen could possibly be why some girls expertise implantation dips.

Estrogen ranges are additionally greater in girls who’re pregnant. This truth may clarify why a temperature decline is seen extra continuously on being pregnant charts. Nevertheless, even non-pregnant girls get the secondary estrogen surge in the course of the luteal section, which is why the dip additionally seems on non-pregnancy charts.

Some girls additionally discover a dip the day earlier than they ovulate, which is probably going brought on by the first estrogen surge that comes simply earlier than ovulation.

Does an Implantation Dip Imply You are Pregnant?

A free fertility charting app known as Fertility Buddy did a casual evaluation of its customers’ BBT charts to see if an implantation dip may point out being pregnant.

Whereas the statistical evaluation of simply over 100,000 BBT charts would not qualify as a scientific research, the outcomes had been nonetheless attention-grabbing. The evaluation reviewed the charts of each pregnant and non-pregnant girls on the lookout for:

  • Charts that detected ovulation
  • Dips in temperature of no less than 0.3 F occurring after ovulation
  • The drop displaying up between days 5 and 12 of the luteal section

On non-pregnancy charts that detected ovulation, 11% had an implantation dip. Then again, 23% of pregnancy-positive charts had an implantation dip. their statistics, twice as most of the being pregnant charts confirmed an implantation dip.

Roughly 75% of being pregnant BBT charts did not have a dip—which implies that in case your chart would not have a dip, you possibly can’t draw a conclusion about whether or not or not you can be pregnant.

And because the implantation dip seems on some non-pregnancy charts, seeing a dip in your chart doesn’t suggest you might be pregnant.

When you’re extra prone to see a one-day temperature drop in case you’re pregnant, it isn’t a definitive signal of being pregnant. You would possibly see a small dip in your chart nearly each month on the seventh or eighth day after you ovulate.

A Phrase From Verywell

Seeing an implantation dip in your BBT chart is extra seemingly if you end up pregnant, however it’s not a dependable signal of being pregnant. Your basal physique temperature chart cannot let you know with any diploma of certainty in case you’re pregnant—you will must take a being pregnant take a look at to know for positive.

Verywell Household makes use of solely high-quality sources, together with peer-reviewed research, to help the info inside our articles. Learn our editorial course of to be taught extra about how we fact-check and hold our content material correct, dependable, and reliable.
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  2. Su HW, Yi YC, Wei TY, Chang TC, Cheng CM. Detection of ovulation, a evaluation of at present accessible strategies. Bioeng Transl Med. 2017;2(3):238-246. doi:10.1002/btm2.10058

  3. Ecochard R, Duterque O, Leiva R, Bouchard T, Vigil P. Self-identification of the scientific fertile window and the ovulation interval. Fertility and Sterility. 2015;103(5):1319-1325.e3. doi:10.1016/j.fertnstert.2015.01.031

  4. Su RW, Fazleabas AT. Implantation and institution of being pregnant in human and nonhuman primates. In: Geisert R., Bazer F, editors. Regulation of Implantation and Institution of Being pregnant in Mammals. Springer, Cham; 2015:189-213. doi:10.1007/978-3-319-15856-3_10

  5. Hendrickson-Jack L. The Fifth Very important Signal: Grasp Your Cycles & Optimize Your Fertility. Fertility Friday Publishing Inc.; 2019.

  6. Sybulski S, Maughan GB. Maternal plasma estradiol ranges in regular and sophisticated pregnancies. American Journal of Obstetrics and Gynecology. 1972;113(3):310-315. doi:10.1016/0002-9378(72)90676-X

  7. Fertility Buddy. Implantation dip research. 2020.

By Rachel Gurevich, RN

Rachel Gurevich is a fertility advocate, creator, and recipient of The Hope Award for Achievement, from Resolve: The Nationwide Infertility Affiliation. She is knowledgeable member of the Affiliation of Well being Care Journalists and has been writing about girls’s well being since 2001. Rachel makes use of her personal experiences with infertility to jot down compassionate, sensible, and supportive articles.

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