UPDATE! okay so today is the 24th...I was supposed to start my period on the 19th...Last night at work I went to the bathroom..wiped and there was a little bit of light pink blood..didn't worry bout it.when I got home from work there was dark brownish blood on my underwear.Last night me and my boyfriend had sex..because I wasn't bleeding everywhere then I ended up having a lot more blood on my toilet paper when I used the bathroom.and I didn't bleed all night on my pantyliner but then I go to pee this morning and there's still light pink blood.Ive been having a little bit of cramping and a lot of nausea but no real period bleeding.am i experiencing implantation bleeding or period bleeding? HELP