Okay ladies, tell me about your pill experience

Emily ☀️ • 🌟✨Diego’s mommy 👶🏼💋🌈💙
So I got off the pill about 3 weeks ago and my period was supposed to come on the 16th. It didn't. I don't expect to get pregnant ASAP. But since my cycle is all messed up, I'm not sure when to expect AF. I'm going on a lil vacation to Vegas with DH on the 24th-27th and I'm really hoping that it doesn't start when I'm there! How long did it take your cycle to regulate after getting off the pill?