Getting back on Zoloft

I'm in the waiting room of my doctor to see about getting back on Zoloft. Ever since I found out 2 weeks ago that I was pregnant, I've become increasingly sad. Realized finally last night this pregnancy related depression. Not surprising given my history of mental health but still a bummer to deal with regardless. Everyone else on here is so happy, and I just feel nothing but sad. :( I do hope the meds help bc 8 more months plus a high probability of post-partum depression for me.