Help?

I started my period 7/1 & it ended on 7/5.

7/12 - 7/16 was my fertile window, with 7/16 giving me 33% chance of pregnancy, & the 17th giving me 22% chance. My boyfriend finished inside me on 7/30 & I was technically supposed to start on 7/31 but I haven't started my period, but I have mild cramps. I'm so confused. We've been together for over a year & that night was the first & last time he's finished inside me until we are ready to get pregnant. He feels like he probably pushed off my period, but I tried to tell him I don't even think my egg is there anymore.. can anyone clear this up for me so I can better understand? He said if I get pregnant right now he wants me to have an abortion. Which isn't going to happen because I don't believe in it for myself. We're both 21 & we live on our own.