Help?

Danielle💁🏼‍♀️🐶🐶
I'll post a picture! But I just ended my period on the 5th. Mind you it started 4 days late. This entire time I've felt pregnant. I've had all negative test. My husband and I had unprotected sex during my ovulation window. Now today I started bleeding again. At first it was all mucusy and then turned to brown blood with mucus. I am in my ovulation window now. I know it's old blood but what I don't understand is why I'm bleeding again? What could it be? Has anyone else had this?
UPDATE: bleeding stopped in the middle of the night and came back in the afernoon. I still have slight cramping. This bleeding is clotting like a period and. The mucus in it is clear and stretchy.