I would ask your doc a.s.a.p., so many meds can cause harm to the developing fetus, including stimulants found in diet meds and ADD meds. In fact some newborns whose mom's using stimulants such as those, go through the same or similar stuff that "crack" babies suffer. ADD meds are not a life or death situation, say, as insulin and/or other life supporting medication. I would definately contact your doc. if you find you are pregnant and take medications so you can find out what is safe or not, to use.
It's also always a good idea to find out about meds ahead of time, before getting pregnant to ensure the safety of mother and the developing fetus.
I'm sending you many good wishes, that everything goes smooth for you.
Please take care now,
DE