I usually get AF (along with all the tell tell signs) on day 26 even though glow says day 28. I’m very regular, wake up with it in the am and cramp the night before. Well Friday (day 26) comes and goes no sign but I had headaches (that I never get)Thursday and Friday. Saturday nothing, but some headaches. Sunday the day that glow predicts as my AF day I had no sign of the mean lady! So 8:00pm rolls around and I went to take a shower and there is some very light blood. Went to sleep at 9:30 with a tampon and when I woke up this morning at 6:30 there wasn’t much on the tampon. And when I wiped there was no blood, nothing. The. A little spot I g at about 9 all very light. I had a headache when I woke up. I’m so regular and my husband and I have been TTC for a year now. I’m so confused could this be late implantation bleeding?!!