Weight gain during pregnancy

So this is my 5th baby. I’m 5’2” and I started this pregnancy weighing 190 lbs. I’m 31 weeks and I weigh 196. I eat plenty and drink plenty and I know I was heavily overweight to begin with but I’m just not understanding why I’m not gaining weight. Tested negative for gestational diabetes. My blood pressure has been on the rise 148/90 last check. Also I’ve been in pre-term labor since week 23. Contractions on and off that require meds. My boyfriend acts like I don’t eat enough and I’m not giving the baby enough. I eat 2-3 full meals and a few snacks. Lots of water. Anyone else in this position?