Lighter then normal period, neg ept, breast grown in 2 weeks?

When did you take: the pregnancy test? If used too early - it may not be accurate yet. The bleeding might be a light period or it may be spotting. You can repeat pregnancy test. Reasons for missed /late periods: low body weight, obesity, marked weight gain or loss, over-exercise such as in endurance athletes, breast-feeding, stress, illness, eating disorders (bulimia or anorexia), travel, hormone irregularities,