Waiting Sucks

Christi
I am on cycle day 36, my average cycle is 39. Glow says af due 1/4. Had a large amount of cervical mucous at 7dpo, tender breasts, heartburn every day (lived with heartburn hell with my son). Had a couple instances of nausea, back aches, and dizzy very often. I don't want to test coz afraid of bfn. When should I test. Also cervix is very high, can barely reach it.