Mid-Upper back pain

I'm 6 wks 5 days pregnant and I have been getting horrible mid-upper back pain. Is that normal? I'm a little nervous because I had a mc in August and I have my first ob appt in two days. I have read about lower back pain, but not much about mid-upper pain. I'm wondering if it's just because my boobs are growing or something. I've taken two Tylenols today, but does anyone have any other suggestions to help? Thanks!!!