The last couple of times we've had sex my boyfriend has ejeculated inside me. Almost immediately after we finish I get nauseous. I've never thrown up, but it is rather bothersome. Same result after oral. I'm 18, and have had the same partner for almost 7 months now. I recently started the depo provera shot. I've only had one shot, and I still had my period. Ive also had my left ovary removed due to cysts, and currently have a small one. I've heard allergy to semen proteins, which seems likely as I've never had any inside me before.