Since you took emergency contraception
within the required time and in adequate dose, its unlikely that you would get pregnant.
Tenderness of breasts can be due to progesterone
use which postinor contains. Also mild spotting can occur after the use of these tablets. Besides your anxiety can make you think that you have these nonspecific symptoms of engorged breasts and tenderness.
But since you are anxious about getting pregnant , you can get a blood test
for beta hcG. Incase its positive then you can consult a doctor personally for abortion.
You have already taken the emergency contraception which is the maximum you can do after an unprotected intercourse
. Nothing more is advised. All you can do is to confirm your pregnancy
at the earliest in case you dont want it. These are usually effective in avoiding pregnancy but not 100% effective.