What are these symptoms?

I started my period when I was supposed to (I’m on birth control) and ended on 11/29. I made breakfast this morning and made what I normally make which is bacon eggs cheese on a plain bagel. While I was eating it, I started to feel incredibly nauseated. Like I said I got my period and it was normal but now I’m experiencing these weird symptoms. My bf and I have unprotected sex but he always finishes out. What could this mean? Am I over thinking it or should I take a test to be safe?