On Sunday 4 am had sex with a lady who I have discovered to be hiv+.All was fine until condom broken. I withdrew immediately and went to clean my penis with plan water. I went to see a doctor who rem mended pep with combivir only due to the briefness of the exposures. I tracked the lady before I commenced pep. We tested together she tested+ and went on to commence pep within 72 hour windows. Please advise chances of infection.