I agree, why stress yourself over people who have repeatedly shown you what awful people they are.
To offer no congratulations is one thing (bad enough) but to offer fuck all in the way of sympathy or support when you’ve lost a pg is (in my 3x mmc losses) unforgivable
To be blunt, and with my experience in this matter, I’d not even contemplate getting remotely excited or tell another living soul until I was in the safe zone, you have quite a way to go until 20 weeks, so just try to carry on as normal, rest, sleep, eat well and keep active and once you’re past the 1st scan THEN think about what you’re going to say and to whom.
For me, I’d put them to the very bottom of the list of people to tell. In fact if they heard via via and had the cheek to be miffed about it I’d remind them how badly they treated you the last time and that given their joy sucking and absolute determination not to offer any support whatsoever to a woman going through a miscarriage, that they should be bloody glad you even give them the time of day let alone any personal details about events in your life.
You are giving them waaaaay too much consideration tbh, they are undeserving of it.
Step back and leave them to it either way. If this pg goes to term, they’ll make it hard for you to be happy, and if it doesn’t, well they’ve shown you who they are already haven’t they.
All the very best, keeping everything crossed for you!