Mother-in-law during first pregnancy

Hi guys, How was the situation with your mil for your first pregnancy? Its our first pregnancy and we're delighted but we chose to only tell a certain amount of people for safety and ease of mind. We did have plans to tell the family once we knew that there were no accidents etc. so, One of the people that we told was my mother in law, and we specifically told everyone including her that it has to be kept a secret and that we're only sharing this secret with her. But recently, my husband visited his aunt and uncle's home to collect some of his belongings he left there, and the aunt kept mentioning about babies and if needed, to get some baby stuff from his cousins etc. Of course, my husband was in shock. As soon as he told me, i felt like my whole world crashed. That's not the worst part, when he called her and ask if she told the aunt and uncle, she laughed and tried to change the subject. He knew that his mom would have even told the siblings and she confirmed, All 6 siblings, whom we've tried so hard to keep a secret from, that we already to plan to tell and surprise them once we meet up, the imagination of them being surprise and happy for us.....*poof* gone. just like that. My mother in law just laughed, she laughed like it was the funniest thing in the world..... She... She broke my heart..... and took away that happiness from us..... Why? I've tried so hard to forgive and tell myself its okay. But i just feel disrespected of my own personal space, and having her be the announcer of all sorts of news. This is why i cannot have the heart to be close to her.... Does anyone have any advice or experience to share? 🥹 I'm just feeling upset and unsure if this is normal :( #bantujawab #firstmom