8 days late, negative tests

I’m 8 days late and have never been late by more than 2 days in my whole (period) life even after going off the pill. I’ve taken a few tests and they come back negative. Having clear/whitish thin discharge just today now. Have booked an appt with doctor for Friday, but still a long ways away it seems. Anyone have any thoughts on what’s happening? Have any of you experienced something similar or have any thoughts on what could be going on with me other than being pregnant I guess?...(I still have a feeling I’m pregnant although looking back at my calendar it doesn’t add up). Kind of making me nervous now!!! 😰