Pregnant without ovulating? Is this possible?

Hi

I’m pretty well-informed about the biology of pregnancy, but that’s leaving me with more questions than answers, as I have found myself in an ambiguous situation.

My cycles are usually pretty regular, with an average length of 25-28 days. I am 18, and was never sexually active until this summer. That was when I started to keep close watch on my cycles. Today is August 24th, and I am awaiting my period that is nearly a week late (the start of my last period was July 22nd… so that puts me at 34 days and counting!). I had unprotected sex (but he removed his penis before he came) on August 13th and August 17th… about a week AFTER I should have been ovulating. So it would have been really hard for me to conceive, right? I’ve taken two pregnancy tests, which both came up negative. I know realize that if I did indeed conceive on these two dates, that it’d be too early to tell with the test (even though it’s way past the first day of my missed period).

I’ve been doing a lot of research, but I can’t find any information that applies to my case. Is it possible for me to be pregnant even though I was most likely not fertile on the days we had sex? Does anyone have ANY information on this? Do you think it’s just possible that I’ve missed my period because I’m worrying sooo much?!

Please give me some info!

Thanks so much