My new body..??

I started heavily bleeding 3 days ago.. saw my ob yesterday, he didn’t seem conerned. Said it could be my first period, I’m breastfeeding and only 6weeks but he said it could happen. Well yesterday at 9pm, to 8pm today, not a single drop of blood. Decided to have sex, and no blood.. I fall asleep and wake up just now and I’m heavily bleeding again.. this body is out of wack