Unprotected sex yesterday and a week ago i had my period; Could i get well pregnant

Yesterday i had gone over to a friends house and me and him kinda had sex but we didnt do it for long cause befor i was giving him a blowjob and so the sex i guess lasted a minute or less im not sure but when he was about to come he didnt want to come in me so thats why we stoped so soon. He asked me if i had a condom and i said no and so he said that we werent going to do it because he could get me pregnant and im like no you cant cause i had my period like last week and he said that he could still get me pregnant...ithen today i was thinking alot about what he said and i was like so unsure if we should have done that cause like he just turned 16 on the 22nd last month and im 13, i wanted to know if that could be true? and if i could get pergnant if he didnt come in me? i need to know cause if he did get me pregnant......well i dont know whats going to happen but i just need to know if its true so i can take a pregnantcy test befor my next period and if it helps i had my period on the 30th of march and i stoped either between the 4-8 of april....please give me some enlightment cause i feel really bad about doing that cause one about the pregnant part and two he cheated on his girlfriend...but i dont see what that has to do with this oh well but i just need some good news please!!