Are Body Ache And Nose Congestion Post Protected Intercourse A Concern?

Hi there, I had protected vaginal intercourse with a woman of unknown status. Two days later, I started developing flu like symptoms. 9 days after this possible exposure, I had a RNA test wich came back negative. At some point my flu started to dissipate but I immediately had a workout and a few hours later I started to feel sick again. 28 days after exposure, I had a 4th generation combo test and was negative. Also a CBC and everything was in range. Two days before the last test I had a workout and shortly after I noticed few red dots on my chest that will disappear the morning after (I was on my last day of amoxicillin dose). For about a week every time after a workout I got few of this dots, they didn t itch... My biggest concern is that I never had these and that five weeks after I started to feel sick, I still have some body aches and a stuffy nose. Could you please help me? Could these dots be related to seroconversion? NOTE: Haven t seen these again after my fourth workout. Thanks in advance.