Variation is common
Periods are not always perfectly regular. Early periods can be especially unpredictable while the body settles.
Common influences
Stress, illness, weight changes, intense exercise, some medications, hormonal contraception, pregnancy, breastfeeding and perimenopause can all affect bleeding patterns.
When to ask for advice
Ask for medical advice if periods stop for several months, bleeding happens very often, bleeding is very heavy, there is severe pain, or the pattern changes suddenly.
Tracking helps
A simple calendar or notes app can help show patterns when speaking to a healthcare professional.