I found out this week that I am pregnant. Don't know my due date, but think it is around November 24th. I have been feeling fine until last night I started to have lower back pain. I can get lower back pain if I move to many heavy things. Not uncommon for me, but now I'm worried since I'm pregnant that maybe it could be a first sign of miscarriage. I have had 3 children and had never had a miscarriage. I do remember when I first got pregnant with my second that I had lower back pain and thought it was premenstrual sign, but turns out I was pregnant. Should I worry?