Period timing out of whack?

Natasha
I was on birth control until about a month ago. I stopped because the hormones were making me feel crazy. Anywho, I had only been on them two cycle packs worth. And when I first got them, I waited a couple weeks before starting so I wouldn't be on my period on my beach trip (haha) so it changed my normal cycle to a different time than usual (I am usually an on the dot 28 day cycle girl- very regular. I am "supposed" to have started yesterday but nothing yet. Negative pregnancy test. This is my first period after coming off my birth control. I'm wondering if my cycle could be out of whack since I pushed it back when I started? Thoughts?