Everyone ovulates at a different time so it is possible but if you have a normal 28 day cycle you would most likely ovulate about 14 days before the start of your period.
wait until your next period is due and if it doesn't come take a test, if it comes than you are fine.
If you dont want to get pregnant you need to get on some birth control.
It is possible to get pregnant and have your period at the same time,You need to call your doctor and make an appointment. Hope it goes well!