Worry wart!!

Cee
I think I'm officially at the point in my pregnancy where I'm going to worry about everything . So today I had a transvaginal ultrasound done and my baby's heartbeat was strong and beautiful and he/she was moving all over the place lol the doctor could barely get 3 good photos ! It measured perfectly and the doctor said everything seemed to be fine BUT I was studying my ultrasound photo today and my baby's head seems abnormally large . It literally looks like a watermelon on a little round body so of course I started looking at all sorts of possible causes including hydrocephalus . Am I being overly paranoid ? Does anyone have additional insight ? It could just be a big head lol but of course I'm worrying .