Miscarriage?

So this morning i felt wetness in my vaginal area so i went to wipe and there's a big chunk of like tissue or something it was pink and white and about the size of a quarter I was thinking it might be from the birth control shot. I've been on it for 2 and a half months and for the first month and 3 weeks I bled continuously and then stopped bleeding for 3 weeks now this blob comes out. What do you think it Is?