Fears getting pregnant due to hypothyroidism

My boyfriend and I have been TTC for for 2 years and 4 months now. In March we discovered that the reason that I haven't been able to get pregnant is my TSH levels are too high. Since then I've been on my medication trying to get my levels back to normal, having my blood checked every 7 weeks. At my last blood work appointment on June 25th, my level was at 8.27. Back in 2017 it was only 2.9. So it's just gotten progressively worse.

I have an appointment next week to get it drawn again to see where where I'm at and I'm scared. I'm scared it's not going to have gone down enough or that it's going to have gone up.

One of the things I've been thinking a lot about lately is can my hypothyroidism cause birth defects? My brother (half on my mom's side) is special needs and has cerebral palsy, a developmental delay, among other health problems. So I'm scared that because of my thyroid condition that it's possible for my kids to have special needs. Not that it's a bad thing, I absolutely love kids with different abilities. I have helped on my brother's special needs little league for 5 years now. I'm just scared I won't be able to take on that responsibility and that I'm not going to be a good mom because I've seen what my mom had to go through and she is just so strong. if you've read this far, thank you, I'm sorry it's so long. So I guess my question is to anyone with hypothyroidism - have any of your children come out with any birth defects or special needs? Have you had safe and successful pregnancies? Is there anything that I need to be worried about during pregnancy? I know that while pregnant you need your levels checked regularly to make sure they're safe.

Thank you for any feedback ❤️