Im supoosed to start my period today.. i went to the bathroom and i wiped and there was only a little spotting and it was kinda light pinkish i put a tampon in thinking i had started my period because i didnt wanna bleed on myself. But its been atleast 5 ,6 hours and i took the tampon out and there was no blood on it.. just little spots of blood. Could this be implantation bleeding ?