Af is late again!

Lisa
Last month AF was 6 days late, doctor thinks chemical since I had a positive hcg then neg. this month it is 8days late and counting. I think o day was the 23rd, I had red spotting on the 29th, lasted only that day. Neg test on the 2nd. I have been cramping on and off for a week. Should I keep waiting for AF or test?? I don't want another negative -_-