My advice, is to stop. Take a deep breath, and realize you're ok.
As a sufferer of PTSD, and someone who has been on Sertraline now for several years, i know the thought of this medication can be quite intimidating. It is however, a wonderful medication once you get passed the initial side effects of the drug getting into your system. I don't want you to be afraid so i am going to tell you about my first experiences with Sertraline, and hopefully, it will put your mind at ease because without this medication i probably wouldn't still be alive right now.
The first day i took sertraline, i remember feeling like my head was to heavy to hold up. My eyes wouldn't keep still. My eyebrows felt massive (i know, this makes me giggle to this day) and i had an overwhelming desire to go to sleep. HOWEVER, the moment you lay down (which i advice having someone around to make sure you get to bed safely now that you have a baby to think of.) your world will spin, and spin, and spin.
It's quite an unusual experience, it can be quiet unsettling and euphoric. but over the course of a week those symptoms will all but vanish.
My PTSD means i relive my trauma in my sleep, and Sertraline stopped me having dreams for over a year. which was amazing. I went to the cinema for the first time in 10 years. I felt happy, lifted, and outgoing. Like the world couldn't affect me anymore.
I felt like i finally had control of my emotions again.
I cannot praise this medication enough, and even though the initial side effects can be scary, the overall difference to the quality of life it will give you in the long run, far outweighs a week or two of feeling "high"
Best of luck to you and your baby, remember.... just breath.