I might have to get a c-section

It obviously didn't go as I planned. I'm measuring at 38 weeks. She said she thinks my baby is about 10 pounds and she said it prolly won't fit through my pelvis with out excessive tearing. Next week we are going to do an ultrasound just to verify if it's just fluid or maybe she is just a long baby cause my husband is talk. I'm so short with no torso and my mom says she was twice my size and she had small babies. But if she is big chunky monkey then she wants to schedule a c-section. I started crying so hard once I got to my car. I am so upset because this is my first baby and I wanted to experience everything from the water breaking to the rushing to the hospital and having a drug free delivery naturally. But now this I don't know what to think. I'm scared. My husband think it's a good thing cause it will be less traumatic if she is big. We can pick her due date. And there wouldn't be the craziness of rushing to the hospital. I know he is trying to make me feel better.