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I had unprotected sex 3 days before ovulation, what are my exact chances of becoming pregnant? #315/9
I had unprotected sex 3 days before ovulation, could I get pregnant?

YES, you can become pregnant unless you were using contraception.


Her reply on 3-12: “Okay, thank you very much.  So, I ovulate on Friday (the 13th) and I had intercourse on Tuesday to Wednesday morning the 11th around 1:00 AM.  My period is due to begin on the 27th of the month, so just wait until then to take a test?  What percentage of chance do I have of becoming pregnant?”


Your risk of pregnancy is probably about 1 in 4 (25%) to 1 in 6 (16%).


Her second reply on 3-12: “So, how does it work, is the sperm just sitting in my fallopian tube waiting for the egg to be released, which would be tomorrow?  Is my chance of getting pregnant high or low?  That is what I want to know.”


If a woman has intercourse 3 days before ovulation, millions of sperm ARE sitting in both fallopian tubes and when that egg pops out, it can be fertilized.  The chance of fertilization and implantation (it is only AFTER implantation that a woman is considered pregnant) is between one in four (25%) and one in six (16%).


 Tell me, are you trying to become pregnant?

Her reply on 3-30: “Good morning, No, I already have 3 children, so I am not trying to become pregnant but if it happens, then I would be okay.  Now I don’t know when I would ovulate as I used to have a 24-day cycle and now it just switched up this month.  My period was supposed to start on March 27th; instead it started on the 24th.  How would I know when I would ovulate so I know not to get pregnant or abstain for the time being?”


Since you are not trying to become pregnant, shouldn’t you consider using some type of contraceptive?

Key Words:  unprotected sex, ovulation, pregnant, intercourse, chances, contraception, fallopian tubes, eggs, fertilized, sperm, risk, high, low

Posted 3-22-2009, Updated 3-29-2009, Updated 3-31-2009 

Robert A. Hatcher MD, MPH
Emeritus Professor of Gynecology and Obstetrics
Emory University School of Medicine
Atlanta, GA

The directors and owners of this website and any publications and information concerning health matters offered here advise a person with a particular problem to consult a primary-care clinician or a specialist in obstetrics, gynecology, or urology (depending on the problem or the contraceptive) as well as the product package insert and other references before diagnosing, managing, or treating the problem.
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