My parents didn't know I was pregnant until after my son was born.I wasn't living in the same province as them,which is how I could keep it a secret.I felt really bad about not telling them and whenever I look at my sister's pictures of the day my nephew was born it makes me sad because most of the pictures have my mom and my nephew and my sister with her son.I don't have anything from that day other than my son.
When I took my son to meet his grandma we had a long talk and I found out that she felt worse than I did that I didn't tell her about my pregnancy.She felt like I thought she was one of those mother's that would freak out.I did think that,which is why you shouldn't heitate to tell her.Even if you think she'll freak out and not love you anymore,you might be pleasantly surprised.
For my mom it was just another child to love and spoil,she loves being a grandma.And she still loves me because I am her daughter and nothing will ever change that.