I haven't had my period since the beginning of February. I haven't been sexually active since then. My breasts are sore and I have felt cramps like I would when my body naturally tells me my period is about to start for about a week or so now. I've taken two tests with the result being negative. I've been taking birth control for 8 months. I did start using "Woman's Ultra Mega energy and metabolism dietary supplement" about a week and a half ago. I wouldn't say I'm stressed, more like preoccupied. I've been working 12 hour night shifts and I've been worrying about my weight, but other than that I'm fine. I'm wondering if maybe I'm over thinking this and just didn't ovulate this month? Someone please enlighten me.