had unprotected sex only once and wonder if im pregnant

for the first time i had sex with my boyfriend , it was 2 days after i was done with my period , he went to the bathroom peed before we started , and before he had cum in me he pulled it out . i was a virgin , i did not bleed and im sure i was a virgin , and im worried some of his cum went inside of me and would get me pregnant , im havin white slimy sticky discharge now , that day was yesterday on sunday . i really need help , i need to know if i might get pregnant because i dont want to , and if there is anything i should do if theres a possiblity to get pregnant . if i should take pills and if the pills have side effects , please please help me with detailed information