How to tell sister in law

How do I announce my pregnancy when my sister in law has been wanting another baby and has been on her husband about it for awhile. We also rent a house they own and I’m scared she’s going to tell him to raise the rent or that we need to move out of spite(she is very jealous) I know she is going to be mad as she has been talking about having another for months but he won’t. should I just wait for the news to get to her or should I tell her myself?