I am a woman worried about possible hiv transmission from a man who's hiv status is unknown. We did not have intercourse, however there was heavy petting. Twice, he touched his penis to lubricate it and touched the outside of my vagina. When he ejaculated he came all over my shirt. When I went to wash it off I noticed that seman had gotten on my arm. I had a day old cut. I have had a dry cough for over a month. I tested negative at 6 weeks. Do I need to retest?