YES! specially if that is your second pregnancy it usually hurts more. It usually goes away before 20 weeks.
this is what I got from the internet because I had the same problem
"Back pain that occurs early on in pregnancy is generally caused by the way that her hormones, particularly progesterone, affect her body. Progesterone softens the discs and the ligaments in a womanâ€™s back. These ligaments and discs support her upper body, and this sort of pain may be accompanied by muscle spasms."
at 3:34 PM on Jan. 6, 2009