Losing a parent

We just lost my mother in law on the 5th and it was very unexpected. My husband and I have been trying to conceive for almost two years. She didn't have any grandchildren so if we would have gotten pregnant it would have been her first. I am worried that If I get pregnant so soon now it will be hard on my husband after losing his mother. He has told me he wants to continue to keep trying but I feel so bad that I couldn't give her a grandchild before she passed away. As if struggling to conceive isn't stressful enough, this is so much more stressful. Help...