Exposure, lancent prick, buffer

Hello, I have got so many questions to ask I hope you can help me out... I have had an unprotected oral sex 42 days ago, the person ejaculated in my mouth but I spit fast and washed my mouth many times with water, then 17 days only oral with a different person, before those 2 I have never had any sexual contact. On a 15 th day of the second sex, I have had sore throat, it hurted only when I would touch my neck nodes not when I swallow, I didn't have high fever at all. A friend of mine tested me with a rapid hiv test 4 generation genes/ani bodies, I am kinda scared now about the lancet, the prick was not deep at all can I be infected somehow? Also my MAIN QUESTION would be, can a test be performed without buffer solution bottle? I'm not sure if he used it...The test came out to be negative after 15mins. I keep thinking about all of this, I'm anxious and I can't sleep at all. Sorry for my bad english, I hope someone could help me, thanks in advance