It is too hard to tell if you are pregnant this early after having sex. Exhaustion, stress or the flu could make you throw up. There are also many reasons besides pregnancy that could make your breasts sore.
You haven't provided quite enough information about your situation for me to give an educated guess. The only advice I have is to wait at least a week and take a test if you think you may be pregnant.
If you are not pregnant and still experiencing these symptoms, see your doctor.