I have been on the TriNesa pill for almost two years now. I started having intercourse with my boyfriend in the middle of June. I have missed a pill before but immediately took it the following morning. The beginning of my new pack of pills I was a day late due to not getting my prescription that following day. I was in the ER for two days due to a concussion and was given nausea medication and something for my headache. I took the pill the following morning and my month went along. I had intercourse once or twice. But my period ended up being three days late. It did come but ended two days later. I'm worried whether it was breakthrough bleeding from being pregnant or just my medication causing it to be late. I've been having stomach cramps following the days after. I have been stressed lately as well. I have a pregnancy test but wanted to get advice from others before I use it. So basically my question is, could I be pregnant? Or is this just a short period?