3 days late but negative tests

Raeleeann • Just a 23yr girl in steel toe boots and a hardhat 🛠️ My little would be 4 this year🪽

Girls I feel like I’m going crazy?! My AF is on the dot every time 3-4 day, light-med flow. But not for October! I’m 3 days late. I didn’t even bother to check until my fiancé said I was acting off so I checked the app and well he was right. I’m 3 days late and I tested this morning and it was negative but I have no symptoms or even feeling of AF coming or anything. Any ideas?