I got the shot about 2-3 days after my period. I haven't stopped bleeding since. It isn't heavy blood until around the time my period usually comes on. It's really putting a strain on my sexual life; though my boyfriend still doesn't care, he said we can just use condoms. But I'm going through boxes of tampons left and right. My next shot is this month, a little before the 18th. How many shots until I stop bleeding? Is this normal?