My boyfriend came inside of me what are the chances i might be pregant? also when is a woman most likely to get pregant in her cycle?

Possible: POssible: Unprotected sexual intercourse will ultimately lead to pregnancy> You are most fertile about 2 weeks after the start of your cycle. Here's an idea: Try using BOTH condoms and spermicidal foam, jelly, sponge, vaginal suppositories and or BC pills. Yes I would suggest a pregnacy test 10 days after your last unprotected intercourse.