Period came 2 days early then only lasted 2 days

Han 🌞🌻

They only lasted two days, it was medium flow between 1-2 day changeover but light inbetween. My periods are normally 4 days. I’ve been feeling really light headed, constant headaches and just unwell. Not sure whats going on - has this happened to anyone? Is this normal when TTC? Took a cheapy test and BFN 🤷🏽‍♀️