Help me

Katie
So me and my boyfriend have been dating for a good while. When I say a good while I mean 1 year, we have had plenty of sex but all of it has been protected. However. We had sex last night and we didn't use a condom, he pulled out. But after like 2 mins we went again and had sex unprotected again, I'm now scared I will be pregnant because of the sperm left on his dick from the previous sex... please someone help