You could be, but I wouldn't worry just yet. OR maybe you'll be happy to be pregnant too, I don't know. Are you very regular? Is being late very unusual? Obviously you're worried enough to ask for advice. I hope a few women answer this for you. They will know better than I, though, I have been on the male end of such a situation before. I know the fear etc.
Go to the store and buy a test kit. After that don't have unprotected sex anymore. Those kinds of decisions can significantly change 3 people's lives forever, and possible the lives of those around them too. I don't mean to preach I am sure such thoughts are swirling through your head without me stoking up the fire!
The one thing I know about life, is sometimes it throws us a heavy curve ball, but things can work out with the changes - just fine - if you embrace them. I am trying to say - just stay positive no matter what.
- Best wishes