Implantation Dip

Savat · April 2009

I saw this on FF and thought it was interesting. Just thought I would share since this tends to be a common question around here.

From FF

Here is what we did:

We ran a full statistical analysis on 116,691 charts recently processed by Fertility Friend, both pregnancy charts and charts that did not result in pregnancy.
To be considered as a dip, charts had to show a significant single dip that lasted a single day, occurring between 5 and 12 days past ovulation.

We used a minimum dip size of 0.3F. We also ran the test using several pattern recognition algorithms to validate the correlation independently of the method of measurement.

Here is what we found:

11% of charts that showed ovulation but did not result in a pregnancy displayed this pattern.
23% of charts that showed ovulation and did result in a pregnancy showed this pattern.
Of the pregnancy charts that showed this pattern, the most likely days for the dip to occur were between 7 and 8 days past ovulation.

The data suggest that this pattern is indeed more likely to result in a pregnancy.

Remember, though, if you have this pattern, it does not necessarily mean that you are pregnant. It is just increasing your probability.

No matter your chart pattern, you can still be pregnant as long as you have well-timed intercourse within your fertile time. In the end, the only way to really know for sure whether or not you are pregnant is still when you can reliably take a pregnancy test.