When do you tell?

I walked away from a toxic person a little over a week now and now AF is 5 days late w high and soft cervix for a little over a month. I've had a little brown mucus here and there but nothing more than a slight tiny on pad... 2 BFN thus far. He is returning to the states this weekend- When should I inform him even though I want nothing more to do with him and I want him to NOT share the information if I'm pregnant with his insane ex/mother of his kids- I will put a TRO on both for my safety if need be because she is honestly a mental case and I don't trust her NOT to come after me.

Thanks❤️