I am googling it. And it's scaring the crap out of me. My doctor was supposed to tell me about it from my 20 week ultrasound and apparently forgot until today! At my 32 week check up. Now I have to wait til Monday to get an ultrasound. My doctor just brushed it off and said my baby might be small.. But looking online it seems more serious

your best bet is Google and having questions ready to ask before that exam. I've never heard of it. you can also try youtubing it