i had a mc on the 21st of october, bled for 13 days, i had 2 lots of hcg levels done and they were dropping rapidly plus pregnancy tests a week after the mc were coming up negative, got a positive test on a clearblue digi on sunday, foned the midwife yesterday and she said its unlikely to be retained tissue as tests were coming back negative....so here i am 5 weeks pregnant and no period before this, i ovulated 2 weeks after my bleeding started...hope this helps xxxx