I had a tubal ligation last November. I am always regular for my periods. Last month it was shorter, it usually lasts 5 to 7 days bit was about 4 days, with brown spotting after intercourse a week after sending. I am about two weeks late, never got a period last month. Usually comes around the 25th of each month. I have been having sharp pains in my lower left side right around my c section scar, severe headaches, pain when bending over in my entire abdomen like there is a hard something inside my stomach. No discharge, no blood. My breasts are sore but not as sore as they would be if I were to be getting my period. I took a hpt late one afternoon 4 days ago and it was negative. Could I be pregnant with an ectopic pregnancy?