AF Problems

So normally I have a period once a month.
I missed last month (normally at end of month). I had all my pre af symptoms. On the 14th of this month, I get my period. Normally my blood is brown, and can sometimes turns to red.
This period it was all brown, and it was very light flow.

I'm not on the pill. After I had LJ I went back on the pill, but I ended up having to stop it because I was always sweating and retained fluid.
Since I stopped it in March 2010 my periods have been like clockwork. Until these last few months.

What the bleep is going on with my body?

have you POAS??? could have been an implantation bleed????

I haven't had any pg symptoms just af ones.

Katones- I just poas (first response) and it came up negative.