I had terrible, horrible, no good, very bad lower back pain this morning at school. It hurt to sit down. It did go away within an hour but my first thought was miscarriage. I thought my back had spasmed with my miscarriage in March. Then I realized that my upper back hurts when it spasms, not my lower back. Has anyone else experienced debilitating lower back pain in early pregnancy? I'm 7 weeks 6 days.