My Belly Is Growing At An Extreme Rate. I Am

my belly is growing at an extreme rate. i am 1 month pregnant and and i look like i'm ready to burst. my belly looks like i'm having triplets but i'm only having one. i have so many stretch marks and i feel like i'm about to burst. i went to the doctor two days ago and he said i'm just bloated. my belly is getting bigger all the time. whats wrong with me?