SIL pregnant and soooo happy!!!!

I have suspected my fiances SIL was pregnant and they just announced today that they are. I'm so over they moon excited for them!!! They had a still birth at 41weeks last February. It was very very heartbreaking. If my due date is correct we are only 1 week apart. We haven't announced yet and won't until Easter. That's been the plan for some time now and I'm so glad cuz they really need their moment. We were pregnant last time together as well. My Fiancé thinks we will deliver on the same day since my last 2 babies were both 11days early.