7 months postpartum, miscarriage 12/28.. ovulation?

Stephanie

I’m 7 months postpartum, I had a miscarriage on Dec. 28. After 2 straight weeks, I stopped bleeding for about a week, my boyfriend and I had sex 3 times back to back one night, then the bleeding came back. I’m getting very dark brown spotting for the last week. When would I ovulate? This app says my period is due today.