1 day late period. Barely spotting.

So, I was supposed to start yesterday, but I didn't. Then this morning I thought I had started because there was the faintest pink when I wiped, but I've had no blood since then. I also feel completely normal (Which is awesome, but abnormal). No painful pms symptoms. Just tired and my stomach is a little sensitive but I think that's from the amoxicillin I'm on. Any advice?