Buggy Help!

Amb 🏴󠁧󠁢󠁥󠁮󠁧󠁿

I am 8 weeks pregnant with my first baby, my partner has a brother and sister who already have families and his mum has bought everything for them because they expect it and when I say everything I mean from clothes, bottles, cot, buggy, car seat, me and my partner was trying since March 2017 and conceived around May 2017 but we decided before we even got pregnant that, we was not letting his mum buy any essentials like buggy, cot or anything big, my issue is she has now just offered to buy us a buggy, even though it's still way too early to be buying anything (even though I'm tempted😊) he agreed with me, but now she has asked he is considering letting her buy it and I'm annoyed at him because I don't want to be like the rest of his family and have his mum thinking we expect things from her. Please tell me what you would all do?