sti/std, help pls!😣

i had unprotected sex because i was drunk with the one person i’ve been sleeping with for 2 months now. that was November 28th and 2 days ago (december 22nd) i started getting pimple like bumps around my private area and now i’m worried that i might have caught something and all my clinics are closed. 😭 but i’m also wondering if it may be because i wore new underwear from the store?? without washing, because i was out of town n stayed longer than expected so i had to wear new stuff. i’ve only worn the new pairs of underwear i bought for 3 days