Can I possibly be pregnant?

Okay, some guys do have a pre- that can contain sperm which can get a woman pregnant. That said, it is too early to be "way too much time" since your last period since you just did it last week. Do you have any idea when you should get your period? If not, you can take a pregnancy test but be aware that it could give a false negative. False positives are rare, so if you get a positive you're probably genuinely pregnant (though it is unlikely). If I were you I would wait a few weeks and if you don't get your period, take a test. In the future use a condom every time, all the time. Don't wait to put it on right before he s. That's not soon enough.