Well, my advice is, since your problem isn't chronic but related to specific health scares that are real, I'd have tried therapy instead of drugs, especially if you're pregnant. You just need to learn to better deal with real things that are happening, and medication won't teach you anything, it will only hopefully tamp down the symptoms but then you're on a medication. Have you tried or considered therapy to solve this way of thinking when you're in a bad situation?
I'm no longer pregnant. They had to induce miscarriage. There was never a baby. Empty gestational sac. I'm looking into therapy, but already pay 1k a month for insurance that won't cover anything anxiety or depression related. I don't plan on more children and am addressing the underlying causes of this anxiety. I was diagnosed with Panic Disorder at 15 years old. I'm nearly 39 now. I lived in peace from panic/anxiety for 20 years before the first episode in 2012. I have a very stressful life which doesn't help. The past four years have been especially rough. The Zoloft is to get me through again until the issues are resolved so I can actually function on a daily basis.
In that case, just be patient -- this might not be the drug for you at this time, but only time will tell that -- probably 4-6 weeks to tell for sure if it'll work and if the side effects will be tolerable. Here's hoping it helps you get to where you want to go, but if it doesn't, there are other meds out there that might.