Could I be pregnant?

Long story short my dads friends son went skiing with me, thought of him as a good friend then he kissed me on the ski lifts, I told him I have a boyfriend but it was long distance and made it pretty crystal clear that I didn't like him like that. After that we were on our way home and my dad invited him to come over and hang I was hoping that I could just go home and sleep, my dad didn't really ask my opinion. But basically I was watching tv in my sweats and tank top and I went to my kitchen to get some water and I guess he followed me but he tried to come behind me and pull my sweats down I kinda froze and tried to turn around he wouldn't let me I asked him what he was doing and he said nothing. I wanted to scream no and try and get away but he ended up trying to put his thing in, not sure how far he got in or what but I'm worried that I could be pregnant. I told my dad that we got into a fight and that I was mad at him so I wouldn't have to see him. But it kinda was inevitable because he's the song of my dads friend. I had my period 4 days later on time and I think it was the normal length not quite sure but I feel like I'm having signs of early pregnancy and I haven't taken a test because I can't get to one available and I don't want to tell my parents until I know for sure. I've been googling like crazy and I feel guilty like I betrayed my boyfriend long distance he knows though because I told him everything and he told me it wasn't my fault. What should I do? I know the guy will never bother me anymore ever but pregnant at 16! I'm really stressed and frustrated I'm hoping you guys could help out that would be amazing thanks.