periods don't really matter, even if you had one, you could still use a condom. i think if you want to and you love him, you could. it's your choice,and if he doesn't respect your choice, ditch him.
You'll regret it later, trust me.
Honestly, i think you should break up with him.. and just dont have sex.
I'm 18, and am very glad that im waiting to have sex until i get married.. cuz i know i would've regretted it if i had already did it.
That's my advice.