Pregnant?

Okay so I'm on pill pack three. Just started in December. This month was the first month my bf and I has unprotected sex. More than once in a night lol (idk how but he just keeps going lmao). And he always pulls out. Anyways. Like 4 days after the last time, my boobs started to hurt. They've hurt for over a week now. And this is the first pack that I haven't had any breakthrough bleeding on. Is having breast pain for that long normal? Should I worry about being pregnant?