Hi! So Last Week Me And My Boyfriend Had Sex

hi! so last week me and my boyfriend had sex it was like our third time and when i got home i noticed i was bleeding a little. i didnt know if it was blood from him popping my cherry or if it ws my period. i used tmpons nd it lasted about 6 days, i have an irregulr period and i m not on birth control so im not sure when im supposed to get it, but now im scared i might be pregnant