I'm 18 years old and have a sudden period issue. Up until a couple of months ago my periods started every 4 sundays (28 day cycle), however for the past 3 periods they have come every 2 weeks for example my last period started on the 29th November and ended on the 3rd December, and my latest period has started on the 11th december, only 8 days after the last one ending, which I believe is slightly worrying, and these past couple of periods have also been extremely heavy in comparison to previous, including (sorry for details) blood clots around the size of 20p pieces. It is also extremely difficult to book an appointment with my GP, I'm talking it could be a month before an available appointment! What should I do?!