You SHOULD see your ob/gyn. As they're going to need the paperwork anyways.
I'd just call and see what they say. They might want you to come in. All Dr's offices are different.
Some WON'T see you until you're about 9 weeks, and some don't have a set time to see you!
I'm my dad's ONLY child, period. Thankfully he took the news of both pregnancies very well as he LOVES my husband! The only sad thing is, he's only met my daughter once. He lives in Michigan (he moved there After Hurrican Katrina), and I live in New Orleans.
Before you know it, you'll be feeling your lil bean moving around in there!!
Sarah