Am I pregnant

I am on the pill so I get my period at the same time every month. I get cramps every period and I spot before each of my periods. I am due for my next period in 6 days and I'm cramping already right now, and I have brown discharge that started last night, there's not a lot but it's in my undies. I am sexually active throughout the whole month and don't use any other form of protection other than the pill. Everywhere just says I'm pregnant but I'm not nauseous or dizzy or sleepy, no other signs and I've been perfect with my pill. What is this?