Hey lady's

Bailee
I've been on birth control for about  3 weeks and some days, well I only have 3 active pills left and I've been bleeding and cramping bad and feels like someone is stabbing me in my overys and like a stretching feeling but comes and goes all day, and this has been happing  for 2 days now. I have 3 active pills left and then the 5 inactive pills. Can anyone tell me what may be going on??