I'm 13 and I've had my period since I was 11. I know that my periods aren't regular yet. I normally have 7 day periods. Once, after about 4 days it stopped. Then 5 days later it came back and stayed for a week. I didn't have my period for about 4 1/2 weeks after that. And recently my periods have been getting shorter. Example: My last one was 5 days and this one was 3. Is this something I should mention to my doctor?

Also my cramps have gotten so unusually bad that I cry. And I've asked my friends and they said that this doesn't happened to them.