Missing AF

So af was suppose to come yesterday per glow, usually it's pretty spot on. And today still nothing . Trying to wait to test because usually I'll give in and test the next morning after it's suppose to show and I end up starting that day. I don't have any symptoms usually the day of starting it just hits me out of nowhere so I can't even judge if I feel like I should be starting or not. Today after standing for about half hour I did feel slight cramps so I assumed it was coming on but 4 hours later and still nothing. Trying to hold off on getting a test but looks like tomorrow morning I'll be stopping on the way to work if nothing has happened. Anyone else trying to wait out testing for the arrival of af? Feeling frustrated!