Doesn't seem possible

Cassie 🍩 • Wife of 15 years💍. Mama of 5 with a loss, and my last and final little born 04/18 👶🏻. Occupational Therapist. Far from perfect, but serve a perfect God 🙌🏽.
I am 9 DPO, confirmed with OPK, and I'm also 11 days past the beginning of my natural, 4 week MC. I ovulated literally 2 days after my bleeding from MC stopped (which lasted 5 days). I hope all these #s make sense lol. Well anyway, my husband and I had sex during my supposed ovulation window and I've been feeling quite icky for about 2 or 3 days now. Could I have really gotten pregnant so quickly? I found it hard to believe the OPK just because I had just got done bleeding but it was +. Not sure what to think and I still have a few days before I can take a HPT. Ughhhh! Similar experiences?