I recently had unprotected sex with a women 12 days ago. after 7 days my underarms felt weird like if i went to reach across my chest like something was there. I didnt think anytging was swollen. i had no fever but am worrimg myself to death. it lasted three days amd went away. i once had the same syptoms and tested hiv negative but should i be worried about this. i was on top amd only had sex once.