1. Call your OB and make an appt.
2. Buy some over-the-counter prenatals (I like One-A-Day Prenatals) until you get a prescription
3. Don't smoke, drink alcohol, or do drugs. ;)
4. Eat healthy and drink lots of water and get lots of sleep.
I guess these are your basics, and when you go to the dr. you can ask all the questions you want...