Advise?

I'm currently on the pill, I had my period 2 weeks ago but obviously when you're on the pill it's not a natural period. Anyway, lately I've been having the worst headaches and crying like having breakdowns over NOTHING!! I also have sex like 4 times a week. I dont know what's happening, I'm nor feeling myself. It could just be hormones but does pregnancy come across anyone's mind. (I'm never like this)