Normal ?

I had severe hyperemesis gravidarum (HG) from 5 weeks to 12 weeks, I was constantly sick and throwing up everything and couldn’t keep anything down not even water. At 12-15 weeks, i was eating with the help of medication, but not a whole lot, I’d get full really fast from a few bites or a small meal. But luckily, the baby was and is still doing good. Once I hit 15 weeks, my severe nausea and vomiting went away, I haven’t thrown up in almost two weeks but I still vomit from time to time if I eat/drink something the baby doesn’t like but the problem is that I was 144 before pregnancy and dropped to 127, I eat till I’m full which is just a very small meal fills me up but I haven’t gained any weight. My weight is steady below 130 lbs and I haven’t gained anything. I’m 18 weeks now and last week my baby weighed 6 ounces which is normal and a good weight, so when is my weight gonna pick up even a little ? It’s as if my baby is ok but I’m not.