Fatigued after sex?? (Probably not pregnant)

Monique • Premed 💜

So I had sex last night and when I woke up this morning I was really sore, dizzy, nauseous, and exhausted overall. I really don't think I'm pregnant (I'm on bc) I'm just confused as to why I feel so fatigued?? This has never happened before so maybe it's not necessarily from the sex but I'm not sure. Have any of you guys ever experienced this??