I didn't tell my parents, who I knew WOULD be supportive and WOULD understand the technology, until I had the same thing happen to me...a very traumatic loss.
I knew I needed my mother's support to get through the loss. And she ended up being my most supportive friend through 2 additional IVFs...and unlike some mothers...she didn't irritate me through the IVF process by saying a lot of stupid things...she was just thoroughly supportive and mostly listened.
You'd be surprised at how Mom's react, I think...Of anyone, they understand that desire to be a Mom...and they fully understand the desire to be a Grandmom

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Bless my mother's soul...as she died suddenly, weeks before she had the chance to hold her twin grandbabies...I am glad I have the wonderful memories of her supporting me through the crap of IVF.