I had a miscarriage 10 weeks ago, 4weeks after, i had slight bleeding, 10days after that, i had lower back ache and spotting for another 12days, its another 2weeks now and i started having pregnancy signs, clots ots of blood and negative pregnancy today.

Miscarriage: This is abnormal bleeding, you need to see a gyn. Firstly a blood pregnancy test is needed and if negative need to make sure there isn't any retained tissue from your miscarriage i.e.. An incomplete abortion. This will require ultrasound evaluation. If negative pregnancy test and normal ultrasound and exam, then this is dysfunctional bleeding usually associated with not ovulating yet.

Annovulation: Sometimes it takes up to three months following a miscarriage for everything to go back to normal. Take your prenatal vitamins, take care of yourself and give it time. Otherwise see your doc for contraception.