I'm about to have my third shot of depo. I stopped bleeding straight away after my normal period as I had my first shot half way through my period. about a month ago I noticed light spotting when I wiped after going to the toilet which has been like that for 3 weeks but this past week it has gotten much heavier but still not enough to have to use a pad or tampon. can anyone tell why this happening? I have been to my doctor as I have been having strange stomach pains and all he has said is to wait for the next shot to see if bleeding stops if not I have to have more tests.