Update: AF 2 days late according to pills.

So AF was supposed to come today, according to my BC pills (but it didn't). According to Glow, I don't start until the 17th. It's way off. And last month AF didn't come until after my placebo pills were already over and I had started my next pack. I didn't think I could have my period if it wasn't the placebo week. It also only lasted 3 days when it normally lasts 4-5. I'm starting to think maybe my pills aren't working. I take them correctly, every day and (usually) around the same time. Now (TMI) I'm having clear/white, wet cm and no AF symptoms whatsoever. My periods are usually very regular on the pill. What do you think? Thanks, ladies.