15 days late

Megan

Ok so my last period was Sept 4th and I was spose to get start Oct 2nd and only had the tinest bit of spotting and it went away had nothing Oct 3rd or 4th, then again on Oct 5th tinest bit of spotting but even less then what I had on the 2nd and then again it went away again . Again nothing on the 6th which was spose to be the last day of my period . I have toke 8 pregnancy tests on Oct 8th which were negitive and had a Bata Hcg blood test done on Oct 10th which was negative. It's Been 43 days since my last period and I am 15 days late anyone experience the same thing or have any advice?