could I be pregnant or is it just af on the way?

I'm 3 days late I've taken a pregnancy test on the first day I was expecting to have my period but it was negative. I've been having white discharges, my head hurts, I have lower back pain and I'm feeling nauseous. My bf and I did it the day before I ovulated well according to glow. I don't know if it's just pms or if my wish is finally coming true.