I understand what you are saying, about feeling pressured, not that my husband did that, but I know many women in your situation. I think you need to sit down, face to face, and calmly tell your husband how you feel, emotionally and physically, right now.
I don't think hiding behind your sons is the way to go right now. It sounds as if you are using them as a shield. I can understand why you are doing that, but it's not going to make things easier or better between your husband and yourself. In fact, you are going to cause more problems and why should you drag your children into the middle of it?
Calmly tell your husband, "I just lost our baby and even though physically my body is ready, emotionally I am not and I don't know when I will be ready to be intimate with you again." Then recommend other ways of being intimate, like snuggling or holding each other. Tell him that his comfort and support are what you need right now and that when you are ready to be intimate again he will be the first to know.
I think a lot of times, we forget to communicate with our husbands when we are so deep in grief and they do not know what to do or how to handle us; and then they ***ume that physical love will make us feel better when all it does is remind us of our lost babies.
I am so sorry you are struggling with this situation right now. Please know we are all here for you.
Much love and God's peace.