Yes this is normal. I had laser surgery on my eyes and then when I was pregnant with DS, I had to dig out my old glasses - otherwise I couldn't drive because I just couldn't see!

I was told not to worry too much and they are reluctant to give pregnant women new prescriptions because it is a lot of expense for something which is highly likely to be temporary.

And yes, my eyes went back to normal after he was born. Interestingly, it never happened with DD and it hasn't happened again this time.