As a practical matter, I strongly suggest you deal with your own life, and situation, and let him deal with his own. You two have had enough troubles, and problems together and need to deal with your lives without each other, or you both will be dragged down, and that helps no one.
Now you think you are pregnant again???? By the butthead guy this time? I think you have enough to worry about without dragging the true love in your life into this. Thats how you get thru this whether he goes to jail or not, by focusing on getting your own messy life straight.