Sick to my stomach

Had sex almost 2 weeks ago right before my period (didn't use protection but he pulled out), 2 days ago, and yesterday morning and by last night I though I was gonna throw up today I have been nauseous and sick to my stomach. It feels like I haven't eaten all day and the feeling doesn't change even when I do it. It won't go away no matter how much pepto I take. I don't really know if it is connected or maybe I'm just getting sick. Any advice or comments?