What Causes Delayed Periods And Stomach Cramps?

I recently lost my virginity and im 2 days late to get my period, however, i still feel some cramps that i normally would during my period. Im starting to get nervous and scared that i might b pregnant. I have a couple questions, 1. Is this normal after you lose your virginity. 2. Could this be a result of stress, and 3. How long should i wait to consult a doctor