my bf came in me at least 4 times today...

so it was my bf’s birthday and of course we had to have sex all day (when we could) but he came in me (consensually) knowing that we could go to the store and get a plan b but then it got late and stores began to close and winded up not getting one b/c we could get it tomorrow b/c you can wait up to 72 hrs. getting ready for bed and i realize i started my period....should i still get a plan b??? since i started my period the same day i got came in??? or is it not a big deal and i keep going with my life...HELP