Call them and tell them what happened. Tell them you all are separated. Tell them that he came over (you thinking to reconcile) but he told you about OW and pregnancy and you got angry. You yelled and he hit you. They would investigate more about you and your kids if you don't call. They will think you are trying to hide something. Just tell them the truth. They will probably take pictures and ask for copies of the ones you took.
The cops will help you with the report and everything. I think you should do this. Don't wait any longer!!!!!
After you talk to them, change the locks on your place. This way you don't have to worry anymore.
