why I have still cramping stomach and uterus since almost 3 weeks on and off. my period was due Nov…

why I have still cramping stomach and uterus since almost 3 weeks on and off. my period was due Nov 18 but I got discharged Brown then later got blood on Nov 20 to 22 only 3 days late. and next 2 days I went to bathroom and wipe Brown mucus. my right leg is cramp and feeling numbness and my nipple are slight sore.