I first of all want to wish you luck,as well as say that I think you need not worry about your husband,as I am sure he will know its truly no one at fault here,it just cant be helped.
Just to tell you in case it helps when speaking to your Doctor...I have a friend who went through all this,and also misscarried a few times.<br/Eventualy test showed she needed to have a couple of stitches put in place and it kept her from misscarring.But I dont know if this can be done early in pregnancy if needed or not,as she was about half way though. It took a few losses for the doctors to see her problem and that this was something they could do .
Also had another friend that kept loosing her babies after haveing one girl and found out she could never carry boys,for some reason.
That was many years ago now though,and im sure if she was trying now,that they would be able to implant a female for her so she could have more children.
I wonder if any of this may be your case as well,if Your Doctor hasnt looked into this ,may be its some thing you could think about and bring up.
Im just trying to help,and I wish you luck.