Oh lost, I am so sorry. This is going to be a difficult time for you, and you need to try to be strong and practical, even though you feel 'broken'. I really feel for you and your DD. You must both be feeling scared and overwhelmed.
If she is 10 weeks gone, she needs to get some pregnancy counseling urgently. Whether she continues with the pregnancy or has an abortion, she needs to talk through her options and work out what she feels and what she wants, in time to make a decision. Help her make an appointment as soon as possible. You can find your nearest Brook Advisory Centre here.
Other things will follow on from that. Whatever she decides, there will be practical arrangements to make and she'll need your help. She'll also need your emotional support, but it sounds like she's got that already. :)
The next priority, I'd say, is to get yourself some emotional support. Dealing with teens can be difficult enough, even if you don't hit a crisis like this, and even if you haven't got existing mental health problems. You're in an extra-difficult situation, and you need some extra support. Can you go to your GP and ask to be referred for counseling? Explain the situation - it may help you get support more quickly. Or give Family Lives a ring on 0808 800 2222. They offer free phone support, or you can chat online. I found them very helpful when I hit crisis point with my own DS.
Good luck. :) And keep coming back here for a bit of advice and support, too!