Sister keeps telling me that things will go wrong

Hi ladies,

I'm a bit upset right now. My sister repeatedly tells me not to buy anything for my baby before 30 weeks. She's pregnant with her 3rd child and due 5 days before I am. I'm 15 weeks pregnant with my first child and I'm obviously excited and nervous.

I understand that she's telling me to be cautious. However, she crossed the line today by saying things like 'if you have the baby before 24 weeks then the doctors can't save it', 'if you lose this baby then what will you do with the stuff' etc. Even if things go wrong, God forbid, I still intend to have children of my own in the near future! I told her she was being insensitive and she just rolled her eyes and laughed at me. Am I in the wrong?

Btw, I have bought a bouncer and a pram set. Nothing else. I only bought those items because they were literally half the normal price and were the exact models I would have wanted.

Any advice would be helpful. Thanks.