Depo shot bleeding?

Carolina

I am tired of this spotting ! I’m on my second depo shot and i decided to do the second one because the first one went great, normal period, no weight gain, and not as much acne as expected. Now i took my second one a month ago and i am constantly spotting, can’t have enjoyable sex without knowing that during sex i will be bleeding even if its been a week without blood. I was wondering though, can this bleeding during sex be normal ? Like is it because of the depo or can it he something more serious ?