There is no way to tell if you are pregnant unless you take a hpt. I used to get nauseas when I was getting my af. I am pregnant now, but before I knew I was I wasn't nauseas at all. It's hard to tell sometimes because the symptoms of pregnancy are similar to those before af is due. Taking the test is the only way to tell.
The only way to tell is with a test. Nausea could be from a number of things, pg, stress and someting you ate the night before.
Is it normal to feel sick after sex? It has never happens before but it's just recently started happening, anyone got any suggestions would be great as I am a bit worried