Weight gain during Pregnancy

Hello ladies! So I’m 23 weeks and 6 days today. And I’m been regularly monitoring my weight. My starting weight was 190lbs and I dropped to 182lbs. For the past 2 doctor’s visits (September and October) I’ve been consistent at 188lbs. But my ultrasound last October 8 shows that my baby is almost at 500g in weight. I’ve been eating normally. Doing 4-5 meals a day but I do eat small portions of rice. I’m worried that I’m not gaining weight at all. Is this normal that I’m losing weight but my baby is gaining weight that’s my I’m still at 188lbs? Any advice?