Who is telling the truth? i just want your opinion!!!?

Well im 13 and my waist size is about 22-24 the 1st doctor i went to (for a check up) said i weighed 102 the next day i wasnt felling well so i went again and they said i weigh 100 liek two weeks later i had a fever of 104 so really had to go see the doc and they said i weighed 112 but i still have the same measurements as before and have been doing yoga and i look a bit thinner (result of yoga and the flu) (i eat alot i'm not anorexic or bulemic i promise)so i just want to know which doctor should i trust the 1st one the 2nd one or the 3rd one? Thanks for your help!!!!!