could I be pregnant

I'm on the pill but I took it an hour late 2 days ago and I had sex before and he did finish in me. I've had a head ache for 4 days now and last Saturday he finished in me as well and I took the pill late that Sunday... I haven't taken my pill yet today because I don't have it so I was wondering what are the chances of me being pregnant and I am ovulating. My boobs are crazy sore which never happens during ovulation. Help!!!!