Unprotectec sex, borwnish spotting for 3 days followed by re

Hi. I'm a 29 year old woman. I had unprotected sex with my partner day 4 of my cycle; it was the very last day of my period there was not bleeding jus occasional spotting. He cum inside and I douched right ways, then started bleeding for 2 days with pain. The bleeding stopped but the light pain continued. I douched 3 mores time after that (once/day). Since the cramp persisted I want to my GYN for a vaginal examination. I had GC and Chlamydia tests done and both came out to be negative but he said I had a strep UTI and put on antibiotics (Penicillin VK). He also said that I might have had a cyst disruption. A week after intercourse (may ovulation time) I had brownish discharge for 2 days followed by red spotting for one day and still light cramps. It has been two weeks since intercourse and had about 5 pregnancy tests done and all of them have come out to be negative. Is the spotting because of ovulation or is there any possibility I'm pregnant? I do not know is there is a chance for conceiving right after menstruation. I've very stressed because of this situation, because I do not want to be pregnant now. So is this also part because of the stress?

Thanks in advance