As cold hearted as
Scratch is, I don't think she'd kill a pregnant woman's unborn child. She may kill
Lizzy at some point and try to save the baby, but I think simply for the fact that Lizzy is pregnant, she is alive.
I don't have a definite opinion as to what is going on with Lizzy and
Bricks. It could be a number of things; like she recognized his personality type and knew how to manipulate him into being her protected, but over time he won her over with his general good nature and now they are genuine friends, or they could be shagging. I doubt the latter, though.
I had imagined Lizzy and Bricks would become pals for almost as long as Bricks was introduced. So I'm going to stick with my prediction that this friendship or whatever it is will cause some HUGE friction between
Saul and Lizzy. I can easily picture a scenario where Saul accidentally puts a bullet in Bricks noodle. Or Bricks goes on some Hulk out when he sees that his chances with Lizzy are moot.