weird spotting

brittany
So o found out my baby had stop growing at 9 weeks and I found out at 10weeks, they gave me cytotec to pass the tissue and one the 27th I bleed a lot and had a lot of clots and that's was the only day I bleed. Since yesterday I've had a little bit of brown spotting. I'm kind of confused because I have heard of people getting pregnan two weeks after a miscarriage. My husband and I did have sex maybe three days ago but it seem to soon for implantation. Is this normal? does anyone know what cause is?