terrified: am i pregnant??

my boyfriend and i had sex but he didn't think he came in me, he went to the bathroom after wards and there was cum in his pee, i figured that was normal. almost 3 weeks later at 9 at night i am feeling sick and tired. my period is supposed to happen in 4 days according to this app. my boobs aren't sore, i'm bloated, no morning sickness, can anyone help??