what do y'all think?

Okay so I was on the pill for 3 years and I got off of it last october and I had irregular periods (I would only get a period every 3 months) for a year and this October and November I had regular periods so I believed that they had regulated. And now I'm 8 days late and don't know if I'm pregnant or falling back into an irregular period again. Would it make sense that I regulated and then I'm getting irregular again? Or should I take a pregnancy test? What should I do?