Got my bfp, but now I need help!!!

 I just got my bfp I tested at 9 dpo and I'm now 11dpo with a positive test still. The line is getting darker. My expected period is the 17th. I've had achy feeling in my lower back and lower stomach. I've been terrified that af will show because of this achy feeling. Is it normal to feel tiny cramps in early early pregnancy and it not be af coming?