I Had Unprotective Sex And Lost My Virginity For The

I had unprotective sex and lost my virginity for the first time on my birthday. I do not want to tell no one nor my parents because I don't know if I am pregnant or not. I was on my period when we had sex. He said I would not get pregnant unless he cum in me and he pulled out. I do not know if I am pregnant or not. How long does it take to see that your stomach is getting bigger and that you are?