 [ Symptoms ] how soon are you able to take a pregnancy test after unprotected sex i had unprotected sex on 220 started ovulating on the 21st according to my fertility app took a plan b pill on the 25th just noticed a dark line on my belly on 33 [ Disease ] hi you take a pregnancy test when you miss your next period but you took plan b 2 days to late for it to have worked but to have got pregnant you would have needed to have had unprotected sex 4 days before your ovulation date it takes male sperm 3 days to reach the right place and your egg is only there for one day somehow in you got pregnant it would be a miracle all you can do is wait but all those extra hormone from plan b mat throw out your cycle hope this helps you good luck