Took plan b two or three weeks ago after fooling around on my period and scared myself so I took it. Went to boyfriends the other night and had unprotected sex but he didn't finish in me but finished by another way. Middle of the night we woke up and had unprotected sex but he didn't finish. 6 hours later I took plan b again. I know this was a mistake but I don't know if I should worry or not?