question for all the women who have had a miscarriage.

This question is for the women who have had a miscarriage. I had a miscarriage with my twin boys at 16 weeks on the 11th of last month. I had my postpartum bleeding like usual for almost 2 weeks and then it stopped. On the 31st, my boyfriend and I had rough sex and Immediately after, I started spotting that turned out to be heavy bleeding   for like 11 days. Could that have been my period? Also, every time we have sex now, I spot light pink that turns into brown spotting for a couple days. Is all this normal after a miscarriage?