5 weeks late with light pink period spotting?

So my period is almost 5 weeks late, taken constant pregnancy tests all of which have said negative, however yesterday and today I have experienced a very pale pink light flow, too light to use a tampon and only really present when I wipe. Could this be my extremely late period? Extremely late implanting bleeding or what? I'm 22 years old and a healthy weight, have had regular periods all my life. I am sexually active with my partner and we do use condoms but there's always a chance one could of broke. I am not currently on any hormonal birth control. Any advice would be appreciated.