When to make that first appt.

So, had my annual exam last month, and go figure we found out today we are expecting. I find the irony of that extremely funny, "she said we are a go." Haha those where the magic words. My last pregnancy was a full surprise, and I had my first appt at around 12weeks. By my caluations I'm only 5weeks along now. Do I wait, do I try to schedule an appt as soon as possible, if waiting is way to go how many weeks 1,2 or 3 weeks.