Welcome to Healthcare Magic.
The oral contraceptive
hormone pills cause control of hormonal
tone of body if you have taken them for pretty long or in higher doses.
Same is true in your case.
I think you should not be worried, in a month or two without pills; you will get the Restoration of menses.
Chances of pregnancy
are remote because urine pregnancy test is a good enough test to rely on.
I hope the advise will be helpful for you.