Hi Sara
Congrats! I am 23 weeks + 5days along also with our first we are expecting a little boy
I also tend to worry a bit about my weight I have picked up 9kg! If I look back on my medi clinic baby app I also put on about 5kg round about 15weeks...
What I did find out is that everyone is different someone on our December birth club that is as far along as me said she has only picked up 1kg so guess how I felt when I said I have picked up 9kg!! so don't feel bad as long as you eat healthy and try to still excercise every other day I think you will be fine.
They also say one tends to put on a bit more with your first pregancy...
May you have a happy healthy pregnancy x