Is Pregnancy Possible Despite Taking Plan-B?

I had unprotected sex he did not finish neither did I. Though i do know you can get pregnant of precum. I took the plan b pill within 14 hours. I did have light bleeding from the intercourse immediately. but the next day after I took plan b I have had cramps and i burp and pee alot. its been 5 days since. I had intercourse is there still a possibility to be pregnant