My period is 16 days late, i took a pregnancy test about a week ago & it said negative. Two days ago, i started to experience some slight cramping & my back started to ache a lot. Today whenever i use the bathroom i noticed a VERY faint LIGHT pink on my tp. At first i thought it was my period coming, but nothing. Has anyone else experienced implantation bleeding? I’m thinking about taking another pregnancy test tomorrow, also should i see a doctor soon? It’s driving me nuts.