I know what you are going through its an aweful part of the grieving process. There is absolutely nothing wrong with you.
I know it will be difficult but I would definately suggest talking to your DH about what you are feeling and reassure him that you do indeed still love him and find him desirable and that atm you are just not ready to be intimate with him. Talk about the losses you have had and how they are affecting you emotionally. Women are an emotional species and we need that connection as part of our love making, when we are not right emotionally we cannot be expected to be amorous it is impossible.
He will know that you are still upset about the loss but he may not have a clue how all the losses are making you feel and how sad you are deep down.
I am not sure if I have offered anything helpful, but I can assure you I do know how you are feeling, I have been there and it can take some time to heal.
If you choose not to try in future for more children thats quite ok, but I want to add that if you do think you would like to have more children in future, please don't give up. We all have our roads to travel and our crosses to bear. There are lessons to be learned with every loss and there IS light at the end of the tunnel you just have to have faith and believe something wonderful is not too far away.
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