What does it mean when you have your period and discharge blood clots?

A period is basically when the lining of your womb realises there's no egg to keep safe, and therefore breaks down and exits as a period. It is normal to have some loss of clots/strange blood loss or "snot looking stuff". However, if there has been any chance of you being pregnant, and you have had severe pains/discomfort and large clots, this could be a miscarriage. However, the pain would be far far worse than pmt, and you'd have probably already gone to see your doctor. To recap, loss of clots is normal. If in doubt, always consult your doc