i had vaginal sex with an older African american woman on October 9th 2013 she did give me oral sex for about 3 minutes then i put a condom on i was drunk (stupid thing i know) im pretty sure i put the condom on right well im going to give detail about it so i was doing doggy style and i wasn't all that hard so i told her to get on top and the condom was still on im sure of that. so were doing that for probably 8 minutes im pretty sure my penis pretty limp during this not fully hard but anyways then i ejaculated and still didn't pull out for a little after that i know (stupid thing to do) and then i finally got her off me and the condom was off and stuck inside her she pulled it out right in front of me and i asked her if she had any STDs or HIV she assured me she didn't and said she hasn't had sex in 4 months and was tested 2 weeks prior to us having intercourse i didn't ask for proof though because it was a one time thing but you never really know because people lie about things like this. so about 2 weeks after that i got a little rash the size of a nickle on my ribs it was itchy for about an hour or 2 then stopped, it went away within 4 days but its still there with its brown and it kinda looks like eczema (also i do have eczema on the back of my neck and back of my knees) but i do know you can get rash for an hiv symptom. also i haven't had any other symptoms
so my questions are
1. What is my risk of contracting HIV threw female to male transmission ?
2. Can a rash be the only symptom you get from HIV and how big does it get ?
3. When should i go get tested ?
4. Can you still contract HIV even if you penis isn't all the way hard ?