Feeling Anxious!

We had a baby appointment today and I’m 30w 5d today. My OB said she is a bigger baby and measuring a little ahead and she scheduled an ultrasound to check her weight and size as well as fluid in 2 weeks. I’m a FTM supposed to be due March 26th. I was wondering if anyone else has gone through this experience and ended up going earlier than expected or if anything happened? I’m actually relieved to know she’s doing okay but VERY anxious because I don’t feel prepared at all and our birthing classes are just now about to start on Feb 3!