Please help should I call my doctor or am I overreacting?

I had a few faint positives this cycle and started bleeding the other day first it was very light I just figured oh well AF started. But now I’m bleeding extremely heavy, I have a slight stabbing pain low down on my right side of my uterus area and I’m really lightheaded. Idk if it’s just super bad AF or what’s going on. Idk what to do.