Hypothyroidism and pregnancy

I went to my doctor appointment today (I’m 24 weeks and a half now.).

I gained quite a bit of weight so far (30 lbs) and my doctor and I discussed it over the last appointments. I’m eating well and exercising and overall, there seems to be nothing I can do to control the weight gain. My fingers and toes are swollen, I’m tired and thirsty all day.

My doctor suggested today to these symptoms might hint a thyroid problem (hypothyroidism). I will have to do a blood analysis to check it this week.

Have experience symptoms like that? Was it hypothyroidism in your case? If it is, what could be the impacts on my baby? (I’ve read a little about it on the internet, but, so far, it’s only making me more frightened.)

Thank you for you insights!