I think you need more help with how to cope with the pain and the 'lack of sleep', because both are going to continue for a long, long time.
Fibro sufferers never get the proper 'refreshing' sleep because of the pain they are in, and a new baby will mean that you are going to be awake several times a night for a minimum of months.
Because of this, you need to find the best way of coping with both the pain and the lack of refreshing sleep.
Have you joined any online forums for fibro ? You'll get lots of tips from other sufferers. Also, get an appointment with your GP to discuss safe painkillers to use during pregnancy, because simply taking nothing for the pain is obviously not working for you. You can also try to use things like heat pads, pillows, cool packs etc as different things work for different people.
It's simply a horrible fact that fibro is a very painful and unpredictable condition, which can be severely debilitating, and has no cure. As such, you will have it for the rest of your life, but that doesn't mean that it will always be this good/bad, you just have to find what works for you to help improve your symptoms, but think long term, not short term.