Depression and Anxiety.

I was diagnosed with both for the first time when I was 12. I've never been on medicine because, honestly, I don't think my mom believes me (or the doctors that diagnosed me, for that matter) and by the time I was old enough to decide for myself.. I just never got around to it. 
I know that sounds silly but I would make appointments then have to cancel for whatever reason. 
Now, I'm pregnant with my second child (31 weeks and 1 day). I'm pretty young and I'm going to be a single mother to them both. 
I've felt my depression and anxiety getting worse over the years, and really coming to a big peak lately, and I'm worried I'm going to fail as a mother because of it. 
My question is, if you were me would you go ahead and get the meds now-or wait until after giving birth?