Depo Shot

I been on the shot for 6 months now tomorrow i go in to get my third but for the past 3 months I’ve been “spotting” now i say “spotting” because its blood clots bright red then pink then brown then bright red when i have sex its even more blood. They keep trying to tell me that it’s normal but it’s totally not normal. I had the same issue on the pill and that’s why i tried the shot, now idk if I should get my shot tomorrow or not. I dont want to not be on birth control but all i do is bleed. Anyone have anything similar happen to them ?