Period sex! Is it safe to wear a Condom when having sex during period? Will I get pregnant?

Hello, I’m 14 and I recently lost my virginity about 3 weeks ago. Im currently on my cycle and kinda wanna have sex but I’m not sure if it’s safe or not. My boyfriend always wears a condom and I checked to see if I was pregnant the first time just to put my nerves at rest (it was negative thank god!) but I’m not 100% sure if I should have sex now or not. Can anyone help me and give me some advice and tips, Much appreciated x