How high are the chances of me being pregnant?

well me and my boyfreind had sex i was not on the pill nor any other form of birth control my periods r very iregular so we assume its okay if he nuts n me i was not ovulating an so we finish i felt great the next day i feel a little sick but nothing serious a few days follow my stomache bloats as if i mayb ovulating an one night i had cramps in my abdomen so bad i couldnt walk the next day after no pain med just some sleep im feeling great again my period is usualy iregular but by now it should have came id like to know what are the chances what was causing such pains i do not ask 4 any thing but what u think i kno nobody can tell me 100 percent but what are your thoughts?