Late period because of birth control???

Okay, so I went off the birth control patch about a month ago and so far I am a 4 days late. My mom believes that it's because my body needs to get use to not being on birth control, but I would have though my period would have been earlier rather than late. Also, I've been a bit more hungry lately, and I get sad so easily and I have to pee a little more (not significantly) but the hunger could be from PMSing, same with the crying. Should I do a pregnancy test? If so, when? I just need advice! Thank you! ❤️