First of all how to take postinor 2
Take one tablet as soon as possible after unprotected intercourse
. The sooner that you take the tablet, the more effective it is likely to be. It is best to take it immediately after you receive it. The first tablet should be taken no later than 72 hours after intercourse. Take the second tablet exactly 12 hours after the first tablet. As you must take the second tablet exactly 12 hours after the first tablet, you should work out a time when you will be able to take the second tablet (for example, not in the middle of the night when you will probably be asleep) and take the first tablet 12 hours before then. This means you might need to delay the first dose slightly. You should remember though that the sooner the first tablet is taken, the greater the likelihood of the treatment stopping you from falling pregnant.
Postinor-2 is only intended as an emergency measure. If you have not already done so you should discuss with your doctor other methods of long term contraception
In some cases, 2-3 days following tablet ingestion breakthrough or withdrawal bleeding may occur that generally ceases spontaneously. in the majority of cases the next period starts as expected or somewhat earlier. if the period is more than 7 days late it is recommended to perform a pregnancy
test.In your case it is negative.
You are advised to consult your gynecologist and perform necessary tests.