First baby....?😬

So I'm on the pill. Very recently got back on it. Take it the same time every day. My boyfriend and I had sex twice and he finished inside me several days ago (were pretty darn stupid letting how it feels get in the way of safety). Ovulation week is technically next week (period ended just last week) and I'm feeling quite crampy and nauseous. Could this be just side affects of starting a new pack of pills again, or ovulation? Or....pregnancy? Ive also been very very tired and irritated and I just wanted to know if someone else is like me out there or maybe knows what's going on from this lil description