TTC/ Come On Early/ Blood Clots...

Hi all, just wanted a little of advice really, i have a 3 year old little boy and have been trying to conceive for around 8 months, i had a miscarriage 25th October 2017. But i did not let that stop me, and i have kept trying, i came on one day early this month and been on since Sunday 14th but its really heavy with blood clots and brown discharge/blood. What can this mean? Should i be worried? Every time i change there is blood clots :/

Sorry if too much information.

xxx