Telling my mother in law I’m pregnant for Mother’s Day. Any ideas?

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It’s Mother’s Day in the UK on the 14th of March. I’d like to tell my mother in law I’m pregnant as her gift. Any ideas on how I can do this? I will be 10 weeks at that point. I have a three year old daughter who can help give the news although I do not intend on telling my daughter I’m pregnant for a little while as she’s like a fog horn and will tell everyone.