Very bad cramping and lower back pain

M

I’m having awful cramping and stabbing lower back pain only on one side since Sunday. Yesterday, I started having heavy bleeding, heavier than my period. It is deep red and has A LOT of clots in it. I was a little over a week late for my period. I thought I might have been pregnant as I was having some symptoms and did baby dance during ovulation. Could this be an early miscarriage or something else?