I'm so worried now I just came from my 32 week appointment & was told they're gonna do a growth…

I'm so worried now I just came from my 32 week appointment & was told they're gonna do a growth ultrasound on Sept 2nd I'll be 34 weeks then, now I'm feeling like something is wrong I'm very tiny so pre-pregnancy I weighed 106 & I now weigh 137 but I still look very tiny in the back of my mind I kept feeling like me & the baby weren't growing right & now this extra ultrasound I wasn't supposed to have anymore but I'm glad they're gonna see how she's doing & how she's growing I hope everything is ok with my lil princess😔