Nausea

Hey so I have been experiencing nausea in the evening a lot along with headaches. I had sex two days a go for the first time in a few months but the nausea and headaches have been going on for weeks. I just started school again after Christmas break so I’m wondering if stress could be contributing to it? I’m also on the pill.

Side note: I also started spotting a little the morning after I had sex with that guy. Like I said it was my first time in about 4 months and before then I had been a virgin.