Coming on your period is never much fun.
But when they're so heavy that you're constantly worried about leaking, or you feel physically and emotionally drained because you've lost so much blood, then chances are something isn't right.
In some cases, your heavy period could be a sign of health issues such as fibroids (non-cancerous tumours that grow in or around the womb) or even endometriosis (a common condition in which small pieces of the womb lining are found outside the womb).
Alternatively, it might be nothing at all.
Concerned about your flow? This NHS Choices tool will help to assess how heavy your periods are and determine whether it might be worth speaking to your GP about the it.