brown spotting

hi there all, im new to this so apologise if this question has already been addressed. i recently miscarried at 11 weeks. we have started trying again and im not sure if i waited long enough, doc said wait a cycle and then try which we have but i usually due for period on the 19th of every month but have started spotting a week early is this because my body isnt back to normal yet or did we not conceive? i read a couple of blogs that it might be implantation? (i think that the word) if anyone can shed some light on this it would be very helpful. thank you