I'm so worried about having a big baby. I myself am a tiny person. Before pregnancy I weighed 92lbs and I'm only 4'11. I know ultrasounds can be off, but I'm 32 weeks and they're saying he's 3lbs 13oz. So pretty close to 4lbs already. I didn't get to talk to my doctor after the ultrasound because she canceled our appointment last minute. Should I be worried about his size?