X-Large Baby and no reason for it?

I’m currently 31 weeks pregnant. My baby is measuring BPD: 98, HC: 97, and AC: 96th percentile. My glucose test was an 80. I’ve gained the normal amount of weight for my size (about 18-19lbs so far). The baby’s guesstimated current weight is 4.5lbs!?

OB isn’t concerned with baby’s size. Doesn’t want me to reduce calorie intake or anything. She seemed distracted during my visit which I wasn’t loving.

Have other moms received the same guidance with an X-large baby??

UPDATE:

Ladies, Thank you for the reassurance! I seriously appreciate all of your comments, stories and support. I was feeling so overwhelmed and ill-informed. ❤️🙏🏼 I was blinded by fear there may be something wrong with my baby. Reading your comments have helped me find peace and reassurance. Thank you for your time and support.