Yeah, it's worrying to read that, isn't it?

Did you do an HRT cycle? The medication is necessary to continue the pregnancy, if you have an HRT cycle, as your ovaries are not producing the necessary estrogen or progesterone.
It may also be that your ovaries are not producing enough of the hormones, if you are on some other kind of cycle.

You're going to have to take a leap of faith that your doctors know what they're doing and wouldn't prescribe drugs that will harm your baby. I know someone who went through an HRT FET cycle a while back and has a gorgeous, healthy baby now. And no doubt there are many others on BellyBelly who have taken the same drugs while pregnant with no apparent ill effects on their babies.

Good luck with this cycle!