Oh, how grand that you got emails from your mom! Maybe upon reflection they realized they reacted a little over the top.
It's not that uncommon for parents especially to be that way, they start seeing all their dream for your life and expectations go down the drain. It's not fair that they have them of course, but they are parents. Then of course there is the grandchild factor. Alot of older parents are unaware or just don't know about fertility treatments or that gays can adopt. Also, they may be very aware of how hard it can be for a gay couple, no equal rights and fear for your safety. That is what my mom told me was a problem for her, that she was afraid for my job and life because of how they treated gay people in this country.
My wife is a very grounded and calm person and has been out way longer than I. She told me to give others as much time to accept me being gay as it took me to accept in in myself. I have found this to be true and it helps to keep this close to your heart.
Good luck, keep us posted!