Announcing 2nd Pregnancy!

Hello!

I just found out i am pregnant today! My sister just had her baby 2 days ago. When should i tell everyone? I dont want to take away the special moment of her baby being born. With my first we told everyone as soon as we found out. Its not a big deal to wait to 12 weeks in my family. We are all very close and my sister told me as soon as she found out every time she was pregnant. I was thinking maybe after the new year? Would that be a good amount of time?