BAC level?

Soooo my parents found a tiny bit of alcohol in my room about a month and a half ago and they were a tiny bit shook(I’m 17). Anyways I’m going to a friends house and they told me if they find out I’m drinking I’m “ded” so not tryna get in trouble but I’m also really trying to have a good time. They are kind of crazy and I feel like they would do something wild like breathalyze me the next morning (that’s what our fam friends did to their kids) soo my question is should I be worried that it will show up on the test? I’m 126Ib and am shooting for 5 shots max the whole night. The reason why I’m asking 5 is because if 5 won’t do anything on the tester then it gives an umbrella of safety bc I’ll be drinking less than that probably ya feel..