Hi Renee,
You poor thing, having to cope with back pain already. I don't know if you have heard about the Pelvic Tilt exercise. You can either do it standing up against a wall or down on all fours. If your standing against a wall, inhale while pressing the small of your back into the wall and relax the muscles against your spine, and slowly exhale and repeat several times. I personally prefer doing the exercise on all fours. Just rock your pelvis back and forth, keeping your back straight and flush, slow breathing is important too. It's meant to be a good exercise for combating sciatica pain too.
I hope it helps you, I especially noticed the pain improving over a week or so, then I just kept it up til I gave birth.