So im officially a day late please help!!

Okay so I have not had intercourse in a couple years but me and my boyfriend always have oral. He said that he is a 100% sure he got now precum in me im so scared maybe stress is delaying my period cause I'm freaking out? I'm 17,I can't be pregnant :( I'm so scared what is going on?? Please help!! Does anybody know anyone that got pregnant without having sex??