Not gaining weight

Hi Moms, I’m 18 weeks and at my 16 week apt I was 135lbs. I weighed myself today out of curiosity and I’m still at 135 lbs! I do get hunger pangs occasionally and I eat regularly but I dont seem to be putting on weight. I’m wondering if my 16 week weight also had some bloat which maybe impacted it?

Is this normal or does anyone have any insight? My next apt is at 20 weeks and don’t want to to call my OB just yet...am I worrying over nothing?