An Implantation Dip is when your basal body temperature (BBT) dips below your cover line post ovulation, usually said to occur around 7 to 9 days pass ovulation on average and then continues to rise without falling below the cover line again. 3 to 5 days pass ovulation for implantation dips is said to be rare. Some believe implantation dips are myths, because of varying results in dips and outcomes for pregnancy. Usually it is said when your BBT stays above your cover line without dipping below the cover line, it is a sign that you're pregnant.
This is just a theory, but it seems for some early implantation dips, may lead to earlier positive pregnancy tests. The exception to early implantation dips theory I have found is that some women get early positive pregnancy tests as a result of having a multiples pregnancy, some women gets dips in many of their cycles that do not result in pregnancy and some women like me don't get dips during a cycle that leads to pregnancy.
I saw an example of this fertility chart of what could be an early implantation dip where the woman ovulated on cycle day 16 and had an implantation dip on cycle day 21 (5 days pass ovulation) and spotting on cycle day 24 (8 days pass ovulation) and on cycle day 25 (9 days pass ovulation), this woman had a positive pregnancy test. She continues to take her basal body temperature and get positive pregnancy until cycle day 33 (17 days pass ovulation). And average implantation dips, said to be around 9 days pass ovulation, which I suspect may lead to 12-14 days pass ovulation positive pregnancy tests and late implantation dips lead to getting a positive pregnancy test later then that. I cited the website where I found the photo with the information I shared above.
Click on photo to enlarge
| I take no credit for this chart. It is not mine. |
Not everyone's chart shows an implantation dip, so if you don't have one that does not necessarily mean you are not pregnant. The cycle I got a positive pregnancy test when I was trying to conceive my 2nd child, my fertility chart actually does not show an implantation dip below my cover line. I did however, have the increased rise of my basal body temperature above my cover line.
If your chart has an early dip (it maybe implantation) and consistent raised basal body temperatures, it maybe a sign that you might be pregnant and won't see a menstrual cycle for 36-40 weeks. However, I would wait for more signs before testing so you do not test too early and get a false negative if you are indeed pregnant. If you do decide to test early (I know it can be hard to wait), because you have one or more signs for pregnancy (or just for curiosity), I would test until a new menstrual cycle starts or a positive pregnancy test.

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