okay, so roughly a year and a bit ago, i gave a man a blowjob, im a teen male, healthy, with no other health issues. i regret it due to the fact i didnt make sure he was negative. so im unaware if he was actually hiv positive. i want to know the odds i may have contracted it. i read some of the forums but i dont believe it to be impossible to not contract via oral. am i justified by being worried?