The SO came in me on Friday! A bit worried!

I have been on birth control (the pill) for four months now and I take it at 11pm each night, at most an hour later, so 12am. This past Friday, my SO came inside me for the first time ever. While this was super hot and super thrilling, I'm a bit worried about becoming pregnant. Sunday started my placebo week and my period should be here sometime between Wednesday and Thursday. If my period comes, do I still have to worry about becoming pregnant from the sperm from Friday? Or will my period "wash out" any sperm as well as the potential egg if I ovulated.