Having a dull pain on the side of the lower abdomen for a day or two in these early weeks of pregnancy can be associated with the fert. egg burrowing into the uterine lining. If it grows into a sharp continuous pain, with or without spotting, then this would be cause to call your doctor. From your description, you shouldn't be alarmed at this time since it sounds quite normal. Good luck to you!
are you pregnant? if you are its most likely round ligament pain. the ligaments that support your uterus as it expands are on the left and right side and pain there is very common.