I quit my depression meds with baby #1 but found I wasn't taking good enough care of myself when the depression got bad. My doctor and I agreed that it was more important that I be able to eat, exercise and sleep well. I stayed on meds for both my next pregnancies. Babies have been fine and healthy (#3 is due in a couple more weeks but so far no problems).
I know it's a really hard decision - of course we want to be as drug-free as possible during pregnancy and breastfeeding. But your baby really does need a mom who can smile and laugh and take care of herself properly. Of course I did lots of searching online with all 3 pregnancies and I never found any evidence of anything to worry about at a low dose (I have dropped my dosage with this pregnancy down to what it was with the first 2 for my own peace of mind).
I really feel for you - I struggled with the decision every time. I feel good about the choice I made and hope you come to a decision that you're happy with too! Good luck!