can you get pregnant the day after your period ends

hi i was a virgin until i lost it recently. i had sex the day right after my period ended. my partner was obviously more experienced than i was. he would pull out before he came. we did not use protection. im scared that i might be pregnant and theres no way i can tell until my next period comes or doesnt come. pleaase help me. what are the odds of me being pregnant? my cycles are usually regular and only last up to 3 to 4 days