Unless 1350 is your maintenance, you need to up your intake. Women in their third trimesters should be eating maintenance +300-500 extra on top of that. Hell, I'm 5'3 and I don't even eat 1350 when I'm not pregnant and trying to lose weight. What has been working for me is eating between 2000 and 2300 calories each day. When I log consistently, my weight gain is good. I'm 24 weeks, and have gained about 31 pounds, but that's just because I didn't log consistently for a good chunk of my pregnancy AND my doctor thinks its likely I'm developing excessive amniotic fluid, which runs in my family. Basically, eat more. It definitely won't hurt anything.

I'm 29 weeks and I try my best to net 1700 calories a day, granted I do give into my cravings, but I log them to keep myself in check (like the 3 doughnuts I ate yesterday I logged, as well as, the football stadium food I ate at my little brother's last football game). If I exercise I eat most of my calories back to stick to as close to 1700 a day. I went to the doctor 2 weeks ago and I was at 19lbs gained so far, I go back tomorrow. I'm on track to gain about 25-35lbs. I was still going to the gym 3-4 days a week, but the last 2 weeks are so I'm lucky to get there twice a week.

you must be starving! I decided to get back into logging when i was about 20 weeks pregnant (hadnt gained much at all really ) and used my old stats from weight loss during the last year as a guide. I WAS on 1500 cals when losing and working out quite a bit and eating back some calories. For pregnancy (and a starting weight of 55kg/120 pounds and 170cm) i am on 1800-1900 cals regardless of any exercise as I dont count it because its nothing vigorous, just walking or occasional yoga. I am now 35 weeks and put on 11kg or 24 pounds. Ill be induced in 2 1/2 weeks. Recommended is 25-35 pounds total for a healthy BMI and i started on the lighter end of healthy. You look slim so i would be thinking closer to 35 would still be safe. All the best!