Still no positive!

R♡
Ive been irregular almost the entire time i started af but the past 5-6 mths, theyve been pretty regular. Glow said i shouldve had af almost a week ago. Ive been emotional (so bad that my husband noticed its more than usual PMS), really bad lower back pain, cramps for about a week and we just feel we ARE pregnant but im still getting bfn! Should i just expect af is just late? Should i wait to take more tests? Go to a doctor?