Hello everyone, just wanna post a quick updates. And i do appreciate your thoughts since im still new with this (i did some readings too):

1. My gf period was due on 20th Sept, but yesterday (22nd) she had a brown blood, and its quiet a lot she said. Not a spotting blood which a little, but she said usually she'll get this before her period come. Could this be implantation bleeding somehow?

2. Through out this month, she had 2 times brownish bleeding, on 1st Sept (just a little amount she said,not spotting also) before sex on 2nd Sept, and around 8th-9th Sept after she goes to the gym ( this one is a lot). The one that concerned us is she did feel kinda tired like 5-7 days before her due period( before this she said only when her period comes she feel tired), although right now she do feel breast tenderness, no cramping yet.

My questions are, is this a sign of her period already due or still missed? Or there is implantation bleeding? How long should i wait after this to get tested? Thanks a lot.