I've had four miscarriages, and "normal" periods didn't happen until about four months after each. After each one, I really felt the need to get pregnant again.
I got a new OB/GYN who helped me through it. She said wait at least three months after "regular" cycles start again, and give yourself a fresh start. Start your pre-natal vitamins and whatnot before you try again to give yourself a head-start. I used the Natural Family Planning method of birth control on top of using condoms (as I can't take hormonal birth control) to figure out when I was most fertile, and we had our girls within 2 days of our projected due dates from the doctors.
You can talk to any Catholic parish (whether you're Catholic or not) to find a couple who teaches NFP in your area. It's the MOST accurate method I've ever used. Best of luck hon, and even though Baby is the biggest thing on your mind, don't forget to have fun along the way! :)