Pregnant or period? Im 16 :( please help?

Ihad protected sex(condom) on june12. After wards we checked it and nothing was wrong with the condom there wasnt even precum in the condom.. So now its june 26 and my boobs been growing because its about that time in the month . My nipples arnt sore but there stickin out (like when your cold) and my boobs arnt sore nor tender so I was wondering what yu guys think. Please include signs I should look out for with my period or maybe pregnancy (alot of details would be nice) Thank you yahoo family :)