Why am I cramping often and discharging brown been off my period 2 weeks notta pregnant for sure?

Could be infection. Your symptoms may just be from an irregular period or you may have an infection. Best to see a gyn for evaluation.
Not normal. Your gyn will need to test for pregnancy (eg miscarriage or tubal pregnancy )with a blood sample as well as tests for infection and uterine disorders (polyps/fibroids etc).