Ok so I know that Implantation bleeding can be mistaken for a period... but does anyone know if its possible to have implantation bleeding on the day you are supposed to be starting you're period?:confused: I was supposed to start my period today and I guess I did.. but its usually HEAVY the first day... sorry to sound gross... but it wasn't... and it is usually bright... but this time it was darker... it look like it usually does on the last day of my period... I don't know if this is how it is for most women or not?? Well thanks for reading and giving me advice!!