Not feeling the greatest after a hookup

This was my 3rd time hanging out with a certain woman. I’m 31 she is too. We had sex. I didn’t use a condom knowing she’s had multiple partners in the past few months. I’ve never done that before. I pulled out, she told me she took an emergency contraceptive when she got home and that she got tested for STI’s last week.

After that she told me she didn’t feel great about the whole experience and that she doesn’t think she wants to continue seeing me. Before she had told me she wanted a casual friendship. It’s not the fact she doesn’t want to see me that’s freaking me out. It’s my poor decision making regarding not using protection and the way she was totally normal and seemed to be enjoying being with me until she got home. I don’t know what to do other than wait for her to get her results and go from there. Lesson learned im never having unprotected sex until it’s the right time again. (Please note I’m coming out of a 10 year relationship/marriage and I’m trying my best to navigate dating at this age).

I don’t know what to do and if I’m overreacting.