How likely will this lead me to pregnancy? need some advise thanks?

Well..like last night me and my boy did like had sex, but he inserted to me just the start of our intercourse and like he did 1 minute or so. but then he pulled-out aand after like 5 mins or 10 then that's the time he did ejaculated. Now it worries me will this situation gave me a high chance of pregnancy? well i can assure you he never ejaculated before because we were together for a week and he urinated almost like a lot. And my last period is started 16th of june. if this helps( thanks)