Hi Doctor I Had An Unprotected Vaginal Sex Lesser Than

Hi doctor i had an unprotected vaginal sex lesser than 2 minutes with my relative for the first time whose hiv status is not known but i had not seen any symptoms of hiv on her body and her menestrual cycle was regular after 11 weeks of exposure i had 1&2 antibody test and result is non reactive. And my WBC COUNT IS 8100 since the exposure i dont feel any symptoms on body and it is my first experience and till today it is the last one . Am i safe or i am at risk?