Hello Friend, Good that you are seeking a help. As your husband is on medication for depression for long term, it's important to understand his current suitation or recovery. . If both of your sexual activities normal, don't worry about your pregnancy. Medicine is just on part of any emotional treatment like depression. Also it will have some side effects. In parallel your husband needs to follow few excersise, dietary changes, meditation, few self therapies etc to get a complete cure and slowly avoid medicine.