With dd I remember that I lost something like 40 of the almost-60 pounds right away--I don't remember exactly how soon, but I want to say within a month, easily, if not sooner. Curiously (or not--other people have echoed this experience and there seems to be some biological evidence to explain it), I didn't lose the final 10-15 until AFTER I weaned my dd at 2+ years old. When I weaned her, that final weight came off almost effortlessly.
My sister lost loads of weight with both her dds (she hadn't gained an incredible amount to begin with--certainly not with her dd1). She was almost scarily underweight at one point, the babies just seemed to suck it all out of her!
The point of these two anecdotes, I guess, is to say that anything's possible! But if you are concerned maybe you should see your midwife or doctor. But if you are feeling fine, I suppose that's a good sign that whatever your weight loss trajectory is, it's within what's normal and healthy for your body.
That said, I agree with the PP that you should take it as easy as you can, mama! I'm sorry about the situation with your dh, though, and I hope that you heal well from all this--physically and emotionally! Hugs!
Mama to a beautiful girl since May 2007 and a beautiful boy since August 2010! :