I am 27. Me and my husband are trying to get pregnant. I was on birth control for a couple years and came off it about 6 months ago or so. I have been irritable and have had sore breasts and nipples for almost two weeks now. All pregnancy tests have been negative. I have had some stomach cramping but nothing big. I figured it was that time of month but my periods are very irregular. I don't get periods monthly. I have never been pregnant before so I don't know what to expect as every women's different. What are the chances of being pregnant?