Help!

Leah • Hey my name is Leah! 21 and pregnant with my first baby. Due date is January 19, 2016 🍼😍
I have been having real bad pains in my lower back the past two weeks. I'm only 7 weeks pregnant, well almost 8. Everyone that I know says that they didn't start having back pains until they were about to have the baby....I don't understand why I have been having them....this is my first baby so I'm worried.