I'm 18 weeks and literally everyone except his ex-wife knows. We know she is eventually going to find out one way or another, but we's like to just get it out of the way when we see her in the next few days.

The facts:

-He and I have been together for a couple years, with full custody of his two kids from that marriage (5 and 9).

-We do not have a good relationship with her as she became a drug addict and makes very very poor choices... (She has harassed and threatened us many times, she's not stable mentally)

-We only see her 5-10 times a year for short, monitored, public visitations.

-She still holds onto an unhealthy attachment to him (will randomly text 'I love you, I miss you' every so often)

-Obviously she doesn't like me

I honestly couldn't say for sure if she'll act happy and excited, or try to hit me! How do you tell someone like this?