Am I pregnant or not?

Okay I need your help please! I got five positive results on home pregnancy tests. Then my cheerleading coach got me a test that the doctors use at their clinics becasue she is a doctor as well. I got a negative on it. She said she thinks it turned out that way because of how my friend, Jenny, made me chug a pop, then a water to make me pee since I've peed twice before that and couldn't go. Also, there was barely any pee in there at all and Chris (my coach) also told me that the pee that first comes out usually has bacteria in it which could also affect the results. Then later I took another home pregnancy test and also got a negative but it could've been because of all the liquid i consumed too? I don't know because I guess if you drink too much liquid to make yoruself pee, it won't be accurate? Please help me PLEASEEE!! Has this ever happened to you? What's the chances of me being pregnant?