1st day of period w/ tampon in hvy bleed. semen rolled down from stomach possibly into the vagina. period usually 6-7 days ended after 4.coincedence?

Not related: Semen on the abdomen would be unlikely to "fall" into the vagina. Some periods are shorter or longer than others. If there is a big change in your periods - for example, if they are much longer or much heavier than usual- check with your doctor. Always use condoms and an effective birth control method if you do not plan to get pregnant at this time.