1st pregnancy, nervous as hell! advice?

Niana • Loving Taylor. Following Jesus.
My husband and I were just beginning to talk about when to start TTC, when I started feeling breast pain & nausea. Took a test and there was the BFP we were definitely not expecting. We are so excited!
But now my mind is reeling, we think I may already be as far as 6 weeks but my af was always so irregular, there was no real way for me to know. 
So I have an appt with my Doc this week & buying some prenatal vitamins today. 
Any words of advice for a first time mom-to-be?