First postpartum period? Almost 6 weeks pp

Hey ladies. It has been about 5.5 weeks since our son was stillborn. I’m obviously not breastfeeding, and I’m anxious to get my cycles and ovulation back so we can start trying again. Since it took us 4 years to get pregnant with him. We started having sex again this past weekend, since I had stopped bleeding already, and Mother’s Day made me incredibly sad since my boy isn’t here with me and I just needed to be close to my husband. We had sex last night and it felt perfectly fine. Then this morning I woke up to a little bit of blood. I assumed it was from the sex, but I hadn’t bled at all over the weekend after sex. Today while I was at work I just felt like my period was about to start. My uterus was feeling so full and kinda crampy and just...off today. The bleeding is kinda between red and brown and getting heavier so I’m assuming it’s my period???