Livinesa, I'm in a very similar boat. 30 years old, starting dental school this fall and would like to start a family in the not so distant future. My husband and I talked about it quite a bit and I've asked around in terms of what constraints school puts on you. The general consensus is that 3rd year is the easiest to have a child. I think we've decided to try to get pregnant in the 2nd year so that we can have it between those two years (ha - if planning actually works). My OB mentioned a couple of things to note. 1. Think about how many kids you want because if you want more than a couple, you should probably get started sooner rather than later 2. There will always be things going on in our lives that will make it seem difficult to have a child. Just pick a time that seems right for you.
I don't know what your life situation is right now, but if you got pregnant now, you would have the baby in Dec/Jan and then have 8 months or so with the baby before school starts. You know, that would be pretty nice. An 8 month old would be a lot easier to handle than a 3 month old, but I guess you have to consider what you'll be dealing with in school and your husband/partner would have to be willing to pick up a lot of slack. I just think that no matter what you are doing now, you probably have a lot more time than you would in d-school. Plus, if you are 31 now, you'll be 32 or 33 when you start D-school, 34 or 35 when you start your third year, and if you want to put a little time between the kids that's a few more years before you have the next one.
Ok, I'm almost done. : ) I just wanted to share something that a pediatric dentist I shadowed told me. She had a kid in d-school. She said it was hard, but doable and she was glad she did it. Her partner waited until she was established in her practice and she says she wishes she would have had her child earlier during d-school.
Good luck to you!!!!!