Could I be pregnant?

So, last month my AF came as usual on the colored pills of my bc. The week after my AF I couldn't find time to go refill my bc, so the following week as soon as I got time I re filled my bc. I took the first pill on Thursday, and Friday I drove up to see my so, having took the pill that day as well I thought we were all clear to have sex, we don't use any other form of contraception and he 'finishes' in me. We also had sex the following day, now before you scold me I totally forgot it took 7 days for bc to protect you fully. Now I am scared I'm pregnant, I'm having what I think are symptoms. I have stopped taking my bc in case I am pregnant. What are your thoughts? Is there a huge chance I'm pregnant or am I over thinking things? Please help!