Help!!!

Sam

I got my first period since getting pregnant Dec 8. The full works for a week. I did NOT get my period in January. So I told my OBGyn because I was taking the mini pill and wasn’t sure if this was normal. On Monday I took a HCG blood test and it came back as <1. Now it’s Friday and I took this first thing in the morning. Is this a false positive since my blood test showed less than 1 HCG?