Say it with me: healthy mom means healthy baby. Talk to your OB. If that person does not have a medication they prefer their pregnant moms to be on, then talk with a psychiatrist or psychiatric nurse practitioner. I went off meds (also for anxiety) to get pregnant for the 2nd time, and white-knuckled it through to the 7th month, when my OB was *happy* to put me on Wellbutrin - she puts smoking moms on Wellbutrin to help them quit, as the side effects of smoking are a greater risk to mom and baby than the side effects of Wellbutrin. She also prescribed a PRN med that I could take when I needed some extra help - don't remember what that was, but she was again more than happy to prescribe it - NOT because she was pill-happy, but because she was, through experience, so convinced of the negative effects of a mom's poor mental health on the baby and, also through experience, convinced of the minimal side effects of Wellbutrin. It is also an older med, so there is a lot of anecdotal evidence of safety for gestation and lactation - yes, you can breastfeed on meds. I eventually switched to Zoloft after my son was born, and breastfed him for two years.
Point being: there are options for you. Talk to your OB first, and go from there. Also, if you are not in therapy now, consider finding a therapist you want to work with. Even if you stay on meds, you will want to marshall all the support you can while you're pregnant - the hormones alone can send you for a loop! Put lots of support in place for yourself - spouse, family, friends, doctors, therapist, and meds - and then see how you feel about getting pregnant. A good therapist can also help you make some long-term plans to make sure you are able to maintain those support systems to give your body and brain chemistry the support it needs to parent two kids.
A doctor once gave me this metaphor - meds can be like wearing glasses. Sure, you can survive without glasses, but you trip a lot, and bump into things, and it can make it hard to read the street signs. So why not wear glasses, and see the world clearly?
Best of luck to you -