Missing period i went from every month to evry other month now it's been on two months neg pt not bf or on bc and no medication that would affect it.

You : You are experiencing irregular periods. This may be due to anovulation, which basically means you may not be ovulating. When ovulation stops a hormonal imbalance occurs in your body, which ultimately leads to a thickened uterine lining. This lining is eventually shed t(your period) however this happens in an abnormal pattern, as in your case., reasons for anovulation are: sudden weight fluctuations(increase or decrease) stress/anxiety polycystic ovarian syndrome (pcos) thyroid disorders..Etc i recommend you consult your primary care provider or gynecologist for a work up of your irregular periods. Good luck.