Pains after sex is this normal or not?

Hello please dont be critical but im 13 and o lost my vorginity yesterday and ever since I have been having stomache pains is that normal ? And also after I bleed alot and then it got lower now my period come when it chooses its not normal I came on december 1 st last year n havent been on since so am I you know the p word also right after sex my stomach begins to hurt