Am I eating enough??

Pre pregnancy I weighed 98 I now weight 116 and I’m about 5’3-5’4 I’m 22 weeks pregnant and at the end of the day I count my calories using this app and it always adds up to be about 1500-1600 calories the doctors also got me drinking ensures to help with weight gain. I just don’t want my baby to starve but I feel so full all the time each meal I force down and it doesn’t help I don’t have much money for groceries also I’m drinking a lot of water everyday and that adds to making me feel full