Chance of pregnancy?

Patient: Dear sir,i had sex with my friend,this is not the first time,we use to use condoms when we have. last time when we had his penis touched my vagina he inserted with out any lasted for 30 sec , after that his penis started bleeding. i spotted out a cream color thing on his sacred, is there any chance for pregnancy? this happened after 20 days of my period has come. now ,im sacred and worried doctor please help me.i dint take i pill this is the 5th day after that incident happened. my period is yet to come on this month 22nd.what are the chances doctor ? how to prevent please help me.