Confused??? No period, no positive?


So I’m a day late for a period, and my periods are like clockwork, to the point I can just about tell you what time of day I’m going to start. But I’ve tested what feels like 100 times and they’re all negative? Like not even a teeny bit of a line. It’s driving me crazy! Is this normal? Do we still have a chance to get the BFP?

Update: still no period but I’m having a lot of discharge, it’s very watery and slightly tan/brown. Any ideas on what this would be?? It doesn’t seem like the start of a period?