12 weeks Anxiety

I'm currently 12 weeks and 2 days pregnant, I was in the ER this past weekend due to some stuff but found out baby was extremely healthy I even saw him/her bouncing around . But I'm nervous, I haven't started to show or round out yet & my breast haven't grown. I'm still throwing up and being sick as ever, but Is this normal for someone almost out the first trimester? I'm just a bit afraid he/she will be underweight or something because I've had a very hard time keeping food down. I'm just worried about growing my next appointment isn't until the 23rd. Help??? FTM