My boyfriend and I had unprotected sex tonight. My period ended yesterday. We have used the pullout method and been good. Tonight he wasnt as on his game as normal and thinks he kept most of it out of me, but thinks a little may have gotten in me. My period is usually 6-7 days and my cycles are from 29-30 days.

How likely is it that I'll become pregnant from this? Should I take a plan b?