hello ladies, I am a FTM and I just got married in 10/17

I found out that I was pregnant a month after I got married (which I was pregnant at the wedding and didn't know). Before I got married I had worked hard to lose 110lbs (345 to 250)

now I'm 19 weeks and 4days and my tummy has grown quite a bit but it is still soft. When I found out I was pregnant my weight was 250 and now at 5months I have gained 25lbs. my doctor has told me she only wanted me to gain 15-20lbs... (😢😢) I need help.on how to maintain my weight and also when will my tummy start to harden. I don't feel pregnant anymore because I'm not having any symptoms only than being hungry and I can't feel anything. I want to know when is my tummy going to harden or will it ever?