I'm scared

Okay so ok sateryda my I had two larg fries form McDonald's and I heaven Eaten there for a while and so till this day which is Tuesday my stomach has been hurting not near my Virginia Iike it tithtens then goes away I felt like throwing up but haven't lose if appetite and I wide it's like a light brown discharge I'm overlatein as well and I don't know if I should take a pregnancy test or what