hi can anyone tell me if my gf is delayed or pregnant? we have sex on march 4, i didnt use anything only withdrawal, and  before i cum i already removed it from her. whats in my mind now is when we are having sex is it possible that i release some inside? coz her menstuation should be on march 24 but till now it did not come.. we worried alot coz we are not yet ready for it. she is only 18 years old.. plzz help me