If my boyfriend and I had unprotected sex on the very last day of my period... and he accidentally bummed up in me some.. what are the serious chances of getting pregnant? I know anytime you have unprotected sex , there is a chance of pregnancy blah blah blah, but what are the real odds on the last day of your period.. I've been experiencing some slightly different changes these past two or three weeks since it happened... just unsure. I wouldn't mind a baby, but not gonna get my hopes up and not going to stress about it. Opinions/advice?