I'm 38 weeks this week! I've had 1 loss in the past, I understand that pain! you are doing great! if you aren't there already, I recommend Premom community! Its really helpful to connect to other pregnant mamas. many there have dealt with fertility issues and loss in the past too!
my second pregnancy I gained 100lbs, went from pre-pregnancy 135 to 237lbs Post partum. it will still be natural to gain weight moving forward but you can maintain a range and plateau where you are at, losing weight may not be easy whilst pregnant. you really don't need to "eat for 2"- listen to hunger cues, if you aren't hungry don't eat/ during eating and feel full quickly no need to clear your plate, leftovers are an option!