For my petite people HELP ME!!

So I found out that I’m pregnant when I was 7 weeks and i went to the doctors and they checked and everything is fine with my little baby and me and they weight me and they said that I weight 93 pounds and I went again last week for 9 week check up and I still weight 93 pounds and I have not gain any weight at all and I’m worry about it and mostly about my baby and i find it weird that i haven’t gain anything because i pretty much eat all day.

Do you guys have tips for me that can help me gain weight anything would be helpful thanks in advance😊