Confusing period

Audrey
Ugh so confused i had brown/light pink spotting on weds then thurs and fri it was heavier but my periods r usually always heavy and usually last 5 days this was 5 days early and only lasted about a day and a half my breasts r still tender and sore could that have been implantation? I have endometriosis could that have caused a heavier implantation bleed??