Sister in law pregnant at the same time


So my sister in law who I do not like and really do not get along with is pregnant and we are due 1 day apart. She announced this week to the family who I also have a very strained relationship with. We had plans to also announce this week because we would all be together. We have decided to wait and let her have this moment and announce at Christmas after she has some time in the spot light. I am worried that they will be upset we waited as I will be a little over half way through. We know it is a lose lose situation if we announce they will say I am trying to compete or overshadow my sister-in-law. If we don’t we kept a secret that we shouldn’t have. What would y’all do?