So i took a oral swab for hiv after 7 weeks of possible exposure. it came out negative. how reliable are these results?

Please see below: Yes, the oral test can be incorrect - but so can blood tests. People can test negative when they’re actually positive and vice versa. This seldom happens and both the oral test and the blood tests are highly accurate. You can always request a blood test if you don’t feel comfortable with the results. There is a very low chance that two tests can both be wrong.