risk of pregnancy?

so yesterday I had sex for the first time. Like we didn't really do too much but we didn't have condom. ik ik it's important and next time we will use. He didn't cum inside me but there still is the precum. He suggested getting a pregnancy test just to be safe. What's the risk of pregnancy just from the little bit we did? ik precum is used to clean the sperm out and if there was any there is a possibility.