I've had a dull ache localized in the left side of my abdomen for 3 days now. Eating seems to have no effect on the ache or its severity. It does not hurt to the touch, and in fact, the pain is only lessened by applying pressure such as lying on my stomach or pushing down on it. My bowel movements are regular, and I have not noticed any blood or blackening. I was on the birth control pill for years, but went off of it 3 months ago and have yet to get my period (though I understand it takes time your schedule to regulate again). Any ideas what this might be?