Helppp meee pleeeeeeaaaaeeeeee…

okay right im 14 and about 3 weeks ago i gave this boy a bloww jobb and thats all we did and thats all ive ever done ive seen him around before but never like spoken to him untill then and i dont know whether to go to the clinic or not to get checked as he has slept with girls brfore do you think i should? and what would the clinic do would i have to take my pants of because i dont wnat too really my friend said she'd come but i dont really want to get my body out and i dont really feel any different i was a little late for my period but im never bang on time so i really dont no what to do!