Okay, I'm having my period today but it's very light. The tests showed…

Okay, I'm having my period today but it's very light. The tests showed a false pregnancy. I had an ultrasound but they said there's still nothing, it hasn't gotten into the uterus yet. I'm happy that I won't be blaming myself for getting an abortion, I was really worried. But I also think about whether maybe there is a possibility of pregnancy and my period?