Hi I'm a 17 year old who has just finished her first semester of college (very stressful) so my first period this semester was august 24-31. Normally my periods last 6-7 days every 6 weeks. My next period was nov 12-19 then dec 11-16. However I just started bleeding again on the 23rd... Is it normal to only have a week between periods even though my semester ended dec 14? I had some monster energy drinks during the semester and during the last week of school.., could that be the problem?? This is my sixth year of having my period if that helps...