Somethings wrong????

My period started a week late and when it did it was so light it was barley there. Either a brownish color or it was light red/pink. I didnt cramp at all, but this time I’ve been nauseous everyday i woke up. I had to throw out a bag of cheeto puffs that i was eating because all of a sudden i looked at the bag and the thought of them made me super nauseous. I have taken two pregnancy tests... both looks negative. I’m honestly not sure what else it could be. Please leave comments to help me understand!!!