A.D.
The general rule of thumb is that it can take about 3 months for your body to "sort it out" after hormonal birth control and get back to a regular pattern (whatever might be regular for you) of periods.
That said, I wouldn't be surprised if you start back with regular periods after a month or so. You had your first period after the pills, which is essentially a "withdrawal" bleed from the hormones. Your body will come to realize that there are not hormones coming in anymore and will start kicking its own in...and then once you ovulate again, it should start getting back to normal. If you skip your next period (when it would be due), I wouldn't be too surprised. If 2 cycles go by without a period, find a doc...they might need to use a bit of progestin to jumpstart your cycle again.
Also, you can call any local ob/gyn and ask the question...they will likely ask you to make an appointment, which you can do...but you could always cancel it later if your cycles regulate. Besides, it can never hurt to find a new doc to have on hand if you need one! It tends to take much longer to get a new patient appointment than an established patient...so get to know them now when things aren't an emergency.
Good luck!