Feeling super sick after sex?

Maria • Holla at your girl
My sex life just began, and yesterday I had a great time with my love. I mean....it was great. It was also harder than we had ever done it, and all yesterday I felt super nauseous. I have since then just felt a little off. Is it just because it took out a lot of energy? Could this have made me gassy? I know it's a stupid question, but just wondering.