Anti depressants during pregnancy

I've suffered major depression the majority of my life without medication. About two years ago I finally could not cope on my own and got put on different anti depressants to see what would work best for me. Flash forward I'm pregnant with my first child and taking Zoloft daily. I've talked to an advice nurse and she let me know it was in the safe list but I've been reading up on it online and have seen mixed feelings about it. Should I stay on my anti depressant or not? Any advice?