Period started yesterday, but only a few drops of blood one time. got a bfn today on test. still no flow. i'm at day 35 in cycle. ?

How long is your: regular cycle? Can re-take home pregnancy test in a week if still no period. Reasons for missed/late periods: low body weight, obesity, marked weight ^ or v, over-exercise, endurance athletics, breast-feeding, ^ stress, illness, eating disorders (bulimia or anorexia), anovulatory cycle (no egg released), travel, hormone irregularities, drug use, meds (i.e., birth control) or medical problems.