I'm scared just had sex.. What are the chances of getting pregnant ?

I had sex last night .. I'm scare it was my first time and yes we used a condom but I haven't taken any pills or anything .. I was doing some research And I found out that rubbing he's penis around my clit can get me pregnant which we did with out a condom .. Also laying down in the speem or something like that? Ill be buying some pills and plan b just in case .. How big are the Chances of getting pregnant ? I'm 20 sorry I'm just not experience