help me out!!

my man & i recently fooled around & he rubbed my vag with his penis, there was precum & afterwards he fingered me. i've been worrying that i could be pregnant, but he told me not to worry because his ex & him always had unprotected sex & he was continually precumming in her, close to her ovulation days. like we did. we never had sex but i don't know if i'm making myself over think & show the symptoms of being pregnant or i'm stressed so much by worrying about it that its causing my period to be late or i'm about to start my period. i was supposed to start today but never did.. help ladies!!