I have irregular periods. Meaning I always have a period once a month but they will start at different times of the month. My husband and I use no birth control other than the withdrawl method. But I have only gotten pregnant when we planned it. We have been married for 18 years. I have a 15 year old and a 10 year old. I am having all the symptoms of being pregnant. I have not had my period this month. Just took a pregnancy test and it came back negative. I have had a fluttering in my lower right abdomen. Breast are swollen and sore, nausea off and on all day. Cramping with no blood, headaches almost every morning when I wake up. Very moody! Emotional one minute and then the next something can set me off. I don't understand what is going on. When I go to the bathroom a few times I have found pieces of what looks like a mucus plug. I have been cramping a little more today than the past few days but still nothing to the way I usually do when I am about to start. Please help!!!