Hi, My Name Is Alisha. I Have Just Had My

hi, my name is Alisha. i have just had my third child almost 3 months ago and i have been experiencing e regular periods since then, ill get them every second week and they'll be just like a normal period. but this last time my husband and i have had intercourse and i took the morning after pill the night after, it has now been a week since then and now im experiencing bad pain and really heavy bleeding and i have been now for 2 days, i was wondering if it could be a miscarriage or something else.