Natural Alternative to Zoloft?

I’m 17 weeks pregnant and trying to avoiding needing to take Zoloft. I have a good diet and exercise regime, but it isn’t helping enough. I’m still feeling strong depression symptoms. I’m also seeing a therapist once week and have been for the last two months.

What are some natural alternatives? Has anyone successfully treated chronic depression with essential oils or supplements like sam-e or 5-HTP?