Getting a blowjob is one of the most common of sexual activities. In the entire history of the HIV epidemic there has never been a case of transmission to someone in that manner Its safe to tell you that you are not going to make history by being the first.
So No chance of HIV infection
Adding on, may I know the risk of contracting STD through this incident? If yes, which type of most likely STD and is there any window period to conduct STD screening?
It has been about 35 days since exposure and so far, don't think I'm showing any symptoms. However, I'm a little concern because information shows that certain STD would not show any symptoms at all.