My period was supposed to start today, but all I got was a little bit of brown discharge. It wasn't even enough to hit the pad. I'm really worried bvus last time I had sex, near 2 weeks ago, it was unprotected (he pulled out). My period normally works like a clock

Brown discharge is just oxidised blood! Any bleeding (regardless of the colour) during your break week is considered your period regardless of how heavy it is or what colour it is