Just stumbled across your post!

I had the same thing happen when I was pg with DS2 back in early '07, my big toe nail stopped growing. It started growing again after he was born, but it was a new nail underneath and it slowly pushed the non-growing one up until I eventually cut it all off (this took a LONG time). I thought that was it, but nope! It is happening all over again AND is happening to the big toe on my other foot . Apparently it could be a kind of fungus (I Googled, haven't asked a Dr ). It might be worth chatting to your GP? I know I should . If I find out any more info I'll let you know.