When DF and I told our parents, I was 7 weeks too. We got both our mothers these really nice knitted shawls and knitting needles and said they better get used to them because they were going to be grannies! Lol it was a great way to tell them, although they were a little peeved, as my mother is 48 and DF's is 50, but they loved the way we did it none-the-less. Good luck telling them, I'm sure you'll think of a brilliant way