I've been on the pill for 4 years and my period ALWAYS comes on the third day of the sugar pills. Even before I went on BC my periods were always very predictable. A few days before my sugar pills started I missed one of the active pills. My husband and I had (unprotected) sex twice around that time as well. I'm now on my seventh day of sugar pills and I've had a couple of spots, and then woke up this morning with very light bleeding (heavier than spotting, way way lighter than my normal period). My normal period is very heavy (go through 6+ pads a day), at the light rate I'm bleeding at the moment I wouldn't be able to fill the pad if I wore it for 3 days straight! The past week I've also been very tired, moody and had slight cramping, also had a couple of dizzy spells as well and been very hungry and waking up several times in the middle of the night to pee.

So I guess my question is, based on the above, am I pregnant, irregular or is it something else like a cyst?