When did you all tell your employer???

So I'm currently 8 weeks along, and just just found out that as of this coming Friday, I won't have a job. I've applied at a bunch of places and currently have interviews lined up for this week- I know not to mention anything specific in the interview, but I'm wondering when I should tell them? 
Say I get hired at 9 weeks, should I wait a month? We are waiting until 12/13 weeks to officially announce besides immediate family, so I suppose that could work. 
This is just the worst time to be looking for a new job, and obviously I want to make sure my benefits/leave are going to be good enough, without sounding suspicious 🙄 lol!
Any thoughts or comments about when you all told your employer would be appreaciate do! ❤