this is my chart my last shot was dec 6,2013

I had a oneday cycle n that was it June 15 had sex the next day then I suppose to started my cycle July 13but nothing glow but me down for the 20 but nothing until july19 had sex then saw a brown spot in my panties then I put tampon in when I took it out it was brown when I wipe in the inside it was pink then that morning I would wipe n see blood not on pad it stop had sex same the next morning wipe see blood then nothing but a lil brown then had sex light pink took a shower nothing. this morning so confused have anyone been through this