Am I pregnant?

I only get to see my boyfriend every 3 weeks due to his job and him being in training right now. I supposedly ovulated between June 15-18. But we didn’t have sex until 19-21. Today June 26, I started getting nipple soreness, lower back pains, and haven’t been able to feel full. I get hot really easily and I’ve been getting headaches. I had one miscarriage back in January, unexpectedly because I was on birth control but decided to stay off ever since then. Could this be pregnancy symptoms?