The next day after my period, my boyfriend and I had sex. He wore a condom and I have been using birth control (trinessa). After we was done there was a little blood on the condom. Then I spotted for two days. One night after eating subway, I threw up but it wasn't major, just some mucus. Then yesterday around 7 pm I started to feel nauseous and dizzy but I think it was because I didn't eat or drink anything all day.

No other symptoms have been happening and I've been taking my birth control regularly.

What is going on?