Day late of menstrual cycle. cramps, saw brown - like blood only when i wipe. there's not else present. what does this mean?

Check PG test: Whenever there is a change in a period, & no birth control measures are in place, the first thing to do is to check for pregnancy. Home pregnancy tests are pretty good if you follow the instructions. If you have not done anything to get pregnant, then changes in periods can have many causes, usually minor. Follow up with your doctor if it persists. If abdominal pain (more than normal) to ER.