Abnormal period or pregnant?

I was on my period when I had my bc removed 4 weeks ago. My husband and I amped up the spontaneity of when and where we went at each other like teenagers, and I kept track. Now this past Thursday I spotted a little then Friday it was heavy and on Saturday I went back to spotting. Since Sunday I have been completely off but I have been more nauseated. Could this be an abnormal period or could I be pregnant?