ive had lower back pain since day one..and im 12 weeks along. sometimes peoples hcg levels dont always double, but since they are rising thats a good sign. you are right in between the guidelines this site has them..
http://www.americanpregnancy.org/duringpregnancy/hcglevels.html
good luck!
i've been having lower back pains since i was around 5-6 weeks. lately it's been getting to the point that it actually hurts to walk. and usually only if i'm standing or have been sitting for a long period of time is when it does hurt. i haven't had spotting though and my cramps have been few and far between. my boobs....they'll hurt like he** one day and then not so much the next. i do know that lower back pains are normal. it could be your sciatic or lombard nerve. i had issues with back pains pre pregnancy and my mom says it's just magnified due to me being preggers. (my hips have issues with slipping out of place) or it could be the way the baby is laying. as long as your not spotting/bleeding i wouldn't worry so much. you could call your doc and ask him/her what the suggest you do about it.
well at least your numbers are going up..thats a good sign
I had lower back pain 3 days before I m/c last week. But I also had heavy bleeding with many clots as well. The cramps were very minor, it barely hurt.