Paranoid about pregnancy

Hello everyone I'm 22 years old and I have not been sexually active for 1 year. I have been afraid to get pregnant even when I'm using a contraceptive method all my life. I started dating a guy and 2 days ago I had sex with him, of course we use a condom. My period started today but I read about implantation bleeding that's similar to menstruation. But I would like to know if there's a possibility of having become pregnant c I also know that I wasn't in my fertile days cause I was just about to start my period. I know that it might sound like a stupid question but I'm paranoid about this.

Thanks in advance

:)