second time having sex, STRESSING, help?!

I just had sex, about 20 minutes ago followed with a shower. It was with a condom and Im not fertile. 8 days till my period according to eve, hopefully ill be fine. Im stressing a tiny bit still, my boyfriend fixed his condom and im stressing about any semen sipping out. My period would probably be a little later from the stress. Help? Any tips?