How long after a cp....

I'm very confused. I recently had an early miscarried/chem pregnancy. I was 5 weeks when the bleeding started on January 27th. I went to the Dr the day the bleeding started and my hcg levels were already down to 10. I bled heavy for 3 days and spotted for 3 more days. My pregnancy tests were no longer positive the days after I started bleeding. Bleeding stopped the night of Feb 1st. Had sex on Feb 2nd. And today ive been feeling off. Though maybe I was ovulating but not having any regular ovulation pains. Decided to pee on a test i had left and I swear there is a vfp on it. Is that even possible. I would have had to have ovulated like the day I stopped bleeding. Has anyone had this happen or know anyone else that it happened to?? Is it even possible??