Is it possible to miss your period. after getting off the pill?

I just stopped taking birth control pills just under a month ago. I was on them for just under a year , and was taking them to prevent pregnancy. While on them, I had my regular period, it was just shorter.

I haven't had my period this month yet, but my body is displaying all the signs that I should have it. I haven't had in a few weeks and even when i did, we took a lot of precautions. And I've taken a pregnancy test, and it came out negative.

Is it possible that I'm pregnant?
Or is this just a side effect of not being on the pill?
Is it possible to miss your period. after getting off the pill?
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