hello , i just want to get an idea from you about pregnancy symptoms, 

because right now i missed my period for almost two weeks and half and im worried if im pregnant 
i and my Bf had a slight sex i mean his own is half inserted. now i missed my period, and the symptoms that i have experienced includes back ache for almost two weeks and the feeling of fainting for two weeks including slight headache. can you give me any insights about this .

thanks