Unusually light period

I've had an unusually light period for around 4 days, so light that it's only really there when I wipe, isn't even enough to go onto my underwear or a pad. I think I'm due my period, but I've taken a test and it was negative. Feeling very nauseous this morning 🤢

Could it still be too early to test positive? This doesn't seem like a normal period to me