Aw that sounds awful hun I am sorry you lost it tonight, happens to the best of us though, you are not alone.

Have you and DP thought about counselling? It may very well help you both speak to each other about the things that are underpinning this experience for you both at the moment.
Unplanned pregnancy is one thing, but an unplanned with an uncommitted must be exceptionally tough.

Check out the private support groups here too, there must be some of us who have had similar experiences and can help.