As far as your period getting "back to normal," this may be your new normal. Age can have an effect on the length of your menstrual cycle, as can a host of other factors. It's actually way more "normal" for your period to NOT be the textbook 28 days; it's just like everything else, in that everybody's a little different.
The hormonal birth control should not affect your period once you are off of it.
In addition, many doctors will give birth control without a pelvic exam; if you have been monogamous and your partner has been monogamous since the last one, for example, if you're not a smoker and have no family history of heart attack or stroke, or simply at their own discretion. Scarleteen does endorse getting regular physical exams, including pelvic exams, but that doesn't always have to be when you're getting a prescription for birth control.
But yeah, if you are concerned, and if it's been more than a year since you've had one, it would be good to schedule that exam when you get your card.
"And when the answer that you want/Is in the question that you state/Come what may..." - Coheed and Cambria, "Blood Red Summer"