Cramps. Anybody else?

I have my period in 7 days but I’ve been cramping in my lower back and a little in my pelvic area. It also happened some last week and weekend. Is this normal since my period is still kind of a ways away. I took a pregnancy test yesterday afternoon and it was negative. Sometimes I get sore boobs around my period time. Is there something wrong with me? Has anybody else went through this I’m also 19. Please any helpful advice. I plan to make a doctors appointment if it keeps happening. But like I said any advice would be appreciated!! Also I’m TTC!