Is this normal

I’m currently having an underweight pregnancy, does that mean the baby will also come out underweight ? Before my pregnancy I was 5’8 114lbs. Now I’m 125lbs. Is my baby too small ? I’m worried because I wasn’t able to hear the heartbeat last time I got an ultrasound since the volume was busted . This was taken at 8 weeks and I’m currently 9 weeks and 4 days . Now my breast tenderness is fading , and my nausea is fading , as well as my bloating being smaller , can someone just reassure me ? I still continue to stay hungry and feel tired all the time.