Missed Period on Pill?

I have been on the Pill (LoEstrin FE) for about 7 months and have had no problems with it. My period is very regular and predictible. Never Early, never late. I always start my period on tue or wed (usually Tue or first thing Wed am). It was due this month on 24 Nov. well on Sunday 21 Nov I saw that I was bleeding so I thought my period came way early, but it stopped. It was just that one time when I went to the bathroom. Mon and tue (Nov 22 & 23) when I went to the bathroom a few times each day, there was light pink on the toliet paper but that's it. After that, no period, no pink on T.P.
I often miss a few pills a month by mistake but still never have a problem. However, this month I missed 6 total, 2 each week.

If this was considered my period, I didn't miss any pills in a row, so I don't know how my body would think I was done with the pills for a month, starting a period.

My first thought was pregnancy but I have no idea when I wouldve been ovulating (my period in October was the 26th to the 28th). So I took an at home test ('Answer' brand) on the morning of Friday 26 Nov and it was negative.

I am under no unusual amount of stress either.

So now that I've ruled out some things, any other Ideas why this could be? Is this actually a missed period?

Any opinions are appreciated!!