Best to get advice from your doctor rather than trying to alter your dose yourself. I came off Citilopram straight from 10mg to nothing and was fine but it was a different matter with Seroxat, which had horrendous side effects. Your doctor will know what the right way to handle withdrawl is.
Good look with the baby making! (And, if it's any help, I've been off anti-depressants for three years and feel better than ever! They helped me though some rough years but I'm glad to say that life can be great without medication too!)