**UPDATE: Belly growing but not gaining weight?

Jordan
Hey ladies, I'm 34 weeks today and had an OB appointment this morning. Over the last six weeks, I haven't gained a single pound but my belly keeps growing and is actually measuring ahead. I think I haven't gained weight because I have had hyperemesis during this pregnancy and I don't have much of an appetite for anything so I only eat the bare minimum when I have to. My OB is sending me for an ultrasound anyway just to check baby's development and the estimated fetal weight. Have any other ladies ever gone through something similar? This is baby #3 for me but I've never had this happen before. Thanks!
**UPDATE:  Great news! Had my ultrasound today (34 + 2) and baby is measuring at 34 + 3 with an estimated weight of 5 lbs, 10 oz! Thanks for all of your replies and reassurance! Wishing each and every one of you the very best 😊 xox.