If you are on regular birth control pills, the chances of pregnancy
are really low. (Unless you missed it) You need not worry about it.
If you still want a second confirmation, now that ten days are over, you can get a Urine pregnancy test done. (After ten days, it will be positive)
If you have any itching in your vagina, you need to get examined to rule out any infection.
If the cramps are severe, you can take an antispasmodic twice daily until cycle stops.
Any further queries, happy to help again.