Does my body miss BC or could it be…

Hi 👋🏽 I’m currently 18dpo (according to app, I don’t track any other ways) and AF is four days late. I’ve taken tests but they’re negative so far, even though I’m having symptoms (nausea, headache, backache, tingly breasts, fatigue, increased appetite, etc.). I had some dark brown spotting around 7/8dpo but nothing since. This is my first cycle ttc since stopping birth control (the pill), but I was recently off of it for a couple months, so I haven’t been on it too long/super consistently. Has anyone experienced this? I’m curious how long it’s taken others to have a “regular” cycle after the pill, and if my symptoms just sound like my body adjusting to the hormonal shift or something else. 🤞🏽Thanks! 🤗