Mine was under 2 pre-pregnancy. I just had my blood drawn (6 weeks pregnant) and its over 5. My endo called and sounded worried and quickly bumped my meds to try and get it back down. I wish I'd had it tested sooner. I'm afraid to google but I know it can cause birth defects if tsh is too high.
Have you been getting checked? What was your most recent?
Re: If hypothyroid, what's your most recent tsh level?
that number earned me a significant increase from 125mcg to 150mcg daily dose by my endocrinologist. i asked him why such a big jump and he said he knew my synthroid dependence would only keep increasing during pregnancy, and he wanted to stay proactive rather than reactive. better to be slightly overmedicated for a short season than be walking around a bit hypo all the time.
my endo likes to keep me between 1 and 2 ideally.
at a 5, you'd definitely need a hearty dosage bump too!
before baby mine was at 1.23 but my doc was working on getting it lower as he prefers all his patients to be under 1 and no higher that 1.5 while pregnant. I'm at 4.6 this week. Another increase on dosage was called in. Take 1 tsp of coconut oil a day it helps thyroid function.
https://www.stopthethyroidmadness.com/pregnancy-and-thyroid-disease/ might help. its a great site in general for thyroid patient advocacy.