Can I be pregnant?

So I had sex for the first time a week or two ago. Ever since then my stomach has been hurting. People say it's normal because it was my first time and my guy was pretty big. (If you get what I mean 😐) so they said of course it's going to hurt. It's just the pain hasn't went away. The only way I know I can't be is because we never "finished". We did use protecting by the way. I would love some advice in this please.