How did you guys track your period after miscarriage?

I lost my son on the 10th. I was bleeding for 2 weeks. After the 2 weeks I went back to having intercourse with my boyfriend at least 2 or 3 times a day. My doctor wanted me to come back to take a pregnancy test but I had to work so I took one at home and it was negative. I've been feeling really weird though and nauseous. I don't know if it's a period coming or a pregnancy.