First cycle off the pill...

So I went off the mini pill last month, and this is my first cycle after that. I ovulated pretty normally, but after charting symptoms and getting a + opk the day before my expected AF, my app said I’ll likely get my period on day 36 instead of day 30.. Usually my cycles are pretty regular off birth control, so I’ve never had it be longer than 31 days but I’m on day 33!! 2 Negative preg tests on Tuesday but haven’t taken any since.. any ladies have a similar experience and been pregnant??? I’m just not sure if it’s just coming off the pill that’s doing this or what