What Do U Think

My bf and I had mutual masturbation on March 21. He touched his penis on theee ocassions and fingered me right away. I was also bleeding since I think he scratched me. Four days later I had light pink blood with mucus and then brown discharge. I am now experiencing really sore breast and light cramps and upper back aches and throbbing sensation down there. I have irregular cycles. My last period was Jan. What are the chances of becoming pregnant like this? And if I have no clue when my period is when should I test? Could I be ovulating right now?