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POP & Luteal Phase Spotting Calculator

What is Your Probability of Pregnancy Based on Recent Spotting

The average probability of pregnancy (POP) for a healthy trying-to-conceive couple is around 20% each cycle. Use this calculator to see how the spotting you experience increases or decreases your odds of being pregnant.


Calculate Your Probability of Pregnancy

Today I am:

DPO=Days Past Ovulation

Recent spotting:




*NOTE: If it's early in the day and you have had no spotting yet today, then you should use yesterday and the day before, because a NO today can't be relied on until late in the day. Select your DPO yesterday, and enter the appropriate spotting based on yesterday.


*Results are based on the analysis of compiled symptom data that has been contributed by our users on this site.
See the full study: Spotting During the Luteal Phase and the Effect on the Probability of Pregnancy