post sex fears?

i lost my virginity today (protected, used pill) and i’m currently having anxieties about being pregnant. does anyone else get this? is this just something that always happens to people who had just recently lost their virginity? we checked the condoms (went two rounds) and both were hole, rip and slip free. we even pulled out before just to make sure, but i’m still scared? what are the chances of me being pregnant?