Do you think it is possible for you to catch an std using unprotected sex and pass it onto your partner and then using the morning after pill? This happened to me. i contracted an std after learning my gf was prego, and have been suspicious ever since. i just finally want to put this to rest and move on. Do you think I am right on calling her bluff that she was faithful? This has wracked my brain, even though my supposedly baby boy is 3 months old. Do you think I should get a paternity test?