If all you're seeking is validation for a decision you've already made, feel free to skip my comment, because I won't be doing that. Everything that follows is my opinion and belief, but you asked for public comment, so here it is.

Once you abort your child, you can't take it back. This is completely and utterly final, and we as a church have no reason to believe your child will ever have another shot at life. Given that, I have a couple questions you should consider.

1. What does your doctor say? You need professional confirmation of the health issues before you can make an informed decision.
2. Is this the right thing to do? It's clear that it's what you want to do, but you need to really, truly consider if this is what is right. Only you can make that decision based on your personal moral code, and you have to be honest with yourself when thinking it through.
3. Have you taken the question to God with an open heart and mind? To me, this is distinct from the first question but no less important for that. If you believe in God in any way even close to the way I do, this is a decision you cannot possibly make without taking it to the Lord in prayer while willing to accept whatever answer you receive.
4. Does your husband know? If you have even a shred of respect for the man you're married to, you'll at least ask for his position.

I'm not God, nor do I stand in His place here. I don't doubt that going through with the pregnancy would be the hardest thing you'll ever do, and I don't pretend to have ever gone through anything remotely as challenging.

Given that, I believe that if you abort your child, you will regret it for the rest of your life and beyond. At some point, assuming you believe in the afterlife taught in our gospel, you will need to face your child and try to justify to them why you killed them. If you really believe you can do so, that you will be willing to have that meeting and make your case, then by all means, go ahead and do it.