Help. Has this happen to you?

So I finished my BC packet in July and got my period like normal. Was one the pill for little over a year. In august by period was due on the 19th and I never got it. On September 7th I got my period but only heavy bleeding for maybe 3 days then that was it. Now my period is supposedly due and it's 5 days late. Took a pregnancy test Saturday and was negative.

**update

I ended up having a miscarriage.

The whole situation happened fast and was just confusing and weird. If anyone would like to know the story/what happen just leave a comment and I’ll tell the story.