PReGNANT!?!?!?!?!?!?!?!?

I have never had . about 8 weeks ago me and my boyfriend were messing around. Im not sure but i think some pre might have brushed on or near my labia. He never went inside me though. I have had 2 "periods" since then. They started on the 28th day of my cylce and lasted 6. They were dark and heavy. They seemed normal to me. I have not fooled around since then. Do you think I am pregnant? I haven't had any symptoms that I've noticed. I should Have started my period yesterday but it never came. I am usually pretty regular and start on the 28th day of my cycle. I feel like I should start any day now but I haven't and Im petrified.