Hi im just wondering average cycle for periods ?? I normally fall on 30/31 its now day 35almost 36…

Hi im just wondering average cycle for periods ?? I normally fall on 30/31 its now day 35almost 36 ive had 2 negative tests, when i wiped today it was light pink a few times only when i really stick the t.p up there , could this spotting just be my period coming extremely late or implantation bleeding ?