Conception is such a tiny, tiny part of parenthood.
The two of you wanted children together, now you are going to have a baby together and your husband is going to be the baby's father in all ways that matter to a child.
Reading your posts, it really seems to me that there are problem with how you are processing your path to motherhood and that you are transferring some of your own feelings on to your DH.
Please contact the clinic where you had your treatment and find out what counselling they offer, for you alone or both of you, jointly or separately.
Coping first with a struggle to conceive, then fertility treatment, then pregnancy can really throw people and I think it's thrown you. Congratulations but acknowledge that this is a huge paradigm shifter and that you will have wobbles ("Wtf have I done?" was what I thought rather a lot when I was finally pregnant after 5 years of trying at the ripe old age of 37).
It is a bit odd that you went through the whole process alone and without your DH knowing - I hope you two become stronger as a couple as you move towards parenthood.
taskmaster, not helpful IMO. And not accurate as according to the OP her DH had agreed to donor insemination as long as he did not know about it.