Your friend let slip a family secret without thinking because she was talking about being a grand mother and she felt absolutely relaxed with you. Hence the 'Ahah' when she realised her mistake.
You will have no reason when meeting her husband to talk about such intimate things with him. So hopefully you will put it out of your mind. Personal decisions by family members are their own private business. By mistake your friend voice a thought that came into her head as she was talking to you. Hopefully you have enough discretion never to pass on the information you were given by mistake.
What is a reasonable minimum spend for an online grocery delivery??
When will this wind ever stop?!
Recommendations please, for a stopover on the way to Loch Tay