The start of my period this month was on December 7th and on the 26-29 I've had light brown/pink discharge with some blood. I had mild cramps on the left side of my abdomine the 26 and 27th then it went away also tender breasts and lower back pain. My upcoming period starts January 4th, should I wait to see if I get my period or take a pregnancy test. Could these be signs of implantation?