Surprised87
Well this really sucks. I am so sorry.
You are doing great under the circumstances, and have lined up several excellent steps.
First make sure you eat and hydrate. You need strength to care for the children.
The one thing you need to do before the lawyers appointment is get a full backup of WW's phone.
There is is a mountain of evidence there. If nothing else it is leverage that can be used to gain a better deal in child custody negotiations.
You should also backup all WW's email accounts.
WW is very likely to start deleting evidence, if she has not already done so.
In vitro DNA tests are now very low risk.
In your place I would get that test.
I also agree with the DNA tests on the other children.
You have been catapulted into a high stress situation. If it is too much then go onto anxiety meds for a while.
Also the 180 really helps you detach and consider your options rationally.
At 11 weeks pregnant, WW has known about her pregnancy for a while. That is 2 missed periods, and as a mother she knows how pregnancy feels.
In your place I would want to know just who WW told first about the pregnancy. If POSOM was told first I would be furious.
Did WW really act exactly as normal during the last few weeks?
It is very important that that you remain relatively civil in interactions with WW. The last thing you need is DV allegations. I would recommend recording your conversations about the situation with WW.
Document your involvement in childcare, that can help in custody negotiations.
Do not move out of the house, at least until you have seen a lawyer: moving out can be seen as abandonment. Frankly if anyone moves out it should be WW.
I strongly suggest that WW provides a written timeline of the A.
The wife you loved is gone. Perhaps she was never who you thought she was. Cheaters lie often, you have to suspect every word she says.
If D is your choice, be prepared for it to get very nasty. False DV or abuse allegations are far more common than you might think: protect yourself. There are posters here who ended up in handcuffs after false allegations.
There is a special section in the 'I Can Relate Subsection' for children of an A. You might find information relevant to your situation there.
Stay Strong.