The only fantasy story (and now movie, I suppose) that I've read recently that involved an actual mother (and husband, and pregnancy, and children) as a main character was "The Time Traveller's Wife". The book, I think, portrayed miscarriage, pregnancy, the troubles of an absent husband, etc., in a very realistic way. And at lease women's issues weren't ignored in that one! ;)

But I agree with you in many respects; there are very few mother protagonists in fantasy. I personally would love to read more.