I am 21. my periods lately have been every 2 weeks. but i've always had regularly periods?? what is going on? how can i fix this? my sex drive is gone

Menstruation: cycles are affected by other medical conditions, especially if there is underlying disease involved. Or this may be your hormones being in transition and you need to be patient and let your periods straighten themselves out. If it has been more than a couple of months, then perhaps you need to see a family physician or GYN for help with controlling your period. Thanks for trusting in HealthTap.