Back pain and peeing a lot can also be a sign you could have a UTI. They can also make you feel pretty horrible and ill, so could be worth seeing your doctor and testing for that. If you test, and it's negative and still no period go see your doctor.
I also have alot of back pain and going pee alot its weird. I dont feel stressed out at all im happy with everything around me. If i dont get my period within the week then yes i will try another test. If that comes out negitive should i just go see the doctor?
I would wait a week and if still no period then take another test, but this time, use first morning urine - it's more accurate.
There are many things that can delay a period and not just pregnancy - stress, hormone imbalance, illness, infection, PCOS for example.
Take another test in a week. If it is still negative, there is an underlying reason for your symptoms. If you are two weeks late, and you had a negative test, it is unlikely that you are pregnant.
Could you just be stressed?