My low back has been bothering me and I've had some cramping, ill give it another week
Well for me it was fatigue and menstrual cramping and implantation bleeding. Every women is different and some don't have symptoms while others do. So I can't really answer that. Since your periods are irregular you need to schedule an appointment to go get a blood test done.
Thank you, if I were to be pregnant what symptoms should I have
I would wait another week to test.