Well it depends on where in your cycle you are. If you are in the middle of your cycle then you have a good chance. If you are not in the middle then your chances may be a little bit lower. Wait until your period is due and if it is late do a home pregnancy test.
Depends on which part of your cycle you are in. If you are ovulating or a couple of days away the chance is like 25%. A lot of people have unprotected sex with the intent to get pregnant for months before they conceive.