Bad anxiety/ depression

I've been having bad anxiety for the past few days. It's not attached to anything specific- I'm just anxious about everything (even totally non pregnancy related things) I also feel depression creeping in. I've struggled with these in the past but I thought I was okay. Now I'm so worried that I'm feeling so low and the babies (I'm expecting twins) are going to be affected. I am on a low dose of sertraline and I worry that it will be bad for the babies. I'm currently 7.5 weeks pregnant. Anyone have any advice or experience to share? Thank you