Over the past few months something strange has been happening. The week before my period I get really nausous, I get sharp pains in my abdomen, I get super tired, and my breats swell up and get really sore, not like normal. The sides of them hurt to the touch and right before my period starts the entire thing hurts, almost like someone punched me in the boobs really hard and they are completely bruised. Each month up until now I start to think that I pregnant and I have taken so many pregnancy tests (we are ttc). Once the period starts, all of my symptoms go away. Has anyone else had this happen? Does anyone know what the cause could be?