I have actualy been sleeping much better since pregnant, BUT i do usually have loads of problems sleeping so i can offer a bit of advice for a new insomniac!
first of all, commiserations. it is truly rubbish not being able to sleep, i hate it , and it really is so stressful. The worse thing is how lonely it feels, and how long the night seems. But you can manage this problem, simply by finding ways to distract your brain from obsessing about 'getting to sleep'. I find that as soon as i stop worrying about getting to sleep, that's when i tend to fall asleep.
the best thing i have found is to listen to stories on tape/cd or on the radio. there are loads of things on bbc iplayer radio, soothing book at bedtime or people reading things. avoid things with loud music or too much drama and shouting. or get a book you really like or want to read on a CD with someone reading it, and let the voice read you a bedtime story like you're a kid again
i find that having something to listen to - which i can understand with my eyes closed - at least stops my mind whirring and stops me worrying about the fact i'm not sleeping.
and at least if you don't sleep you are listening to a good story or learning something informative!
TV doesn't work so good because if you're anything like me you have to keep opening your eyes to look at what's happening!
good luck!