Expert: Catherine Beier MS CBE - 11/9/2011

Question
Hello,
I had my last period on 1st of October and it lasted until 5th. Typically it's 33-35 days before I get my next period. I had sex with A on 11 and 15th, then with B on 18. But after B I took 72 hour pill that prevents pregnancy. I took the pill 24 hours after intercourse with B. I calculated I took the pill after around 90 hours after intercourse with A. On 6th of November I got a faint second line on pregnancy test and today on 9th I got clear 2 lines. I want to know whether B can be the father, is there a slight chance that even after the pill he can be, because my ovulation occured(by calculators) the next day of sleeping with him.

Answer
Yes, it's still possible that either man is the father.  Since the dates of intercourse were less than 5 days apart and both within days of your probable ovulation, it's impossible to say with any certainty which is the father; you'll need a paternity test to decide.  The Plan B pill is not meant to be a routine form of birth control, but only to be used as an emergency backup.  If your wish is to avoid becoming pregnant, then a reliable method of birth control, such as the monthly pill, patch, IUD, or injection, should be used. As these methods of birth control do not protect against disease, a condom or other barrier method is also advised when having intercourse with multiple partners to avoid contracting an STD or transmitting it to current or future sexual partners.