posible pregancy???

hi everyyone my name is gabyy im 15 years oldd ndd i honesltyy dnt kno watz wrongg wit me i had recentlyy had sex aug. 6 ndd somethnqq i thought was veryy odd was datt i got myy periodd tha next dayy wen i wasntt suppose to star til the 11 of diz month the period dat i had didntt last very much it went away like 3 dayz later nd it usually last around 5 - 7 dayz nd juz barlyy 2 dayz ago i been havinqq sum serious stomach pain nd headaches !! i wasntt feelinqq at all well ! ndd i would go to the bathroom alot sounds gross but i would get diarrhea nd i would pee alott ndd juz diz morninqq i wokk up feelinqq veryy dizzy and nauseous i literalyy fell datz how dizzy i was ndd i had realyy bad stomach pain myy dad hadd gavee me sum medicine for tha pain it did help it calmed it down fo awhile nd i went bak to sleep but den again wen i woke up i had tha same symptoms again ?!! all i wanna kno if its poosible i mayy b pregnant i kno its to early to tell but stil i would like to kno :/ or kan it juz b a stomach flu/ infection???