Vaginal bleeding that occurs 10 days after a normal menstrual period is called spotting (metrorrhagia). Spotting is not a sign of pregnancy. It could, however, be a sign of possible pregnancy complication if a pregnancy already existed. Spotting can be functional or organic. Functional spotting, for example, is due to hormonal disbalance. Organic spotting, on the other hand, is due to an organic lesion in the uterus (myoma, polypus, infection etc.). In addition, spotting could be a sign of an STD but not so soon (2 days) after risky sex. You can easily confirm or exclude pregnancy by performing a pregnancy test ... but you should visit a gynecologist to identify the true reason for the 10 days' spotting.