Thanks for the query.
Once check for pregnancy
to rule out that possibility.
If the test comes negative, the possible causes for your irregular periods
-The pink dischrage could be your scanty menstrual flow due to hormonal
-You may get periods soon and the discharge could be spotting during ovulation or inter-menstrual spotting due to hormonal imbalance.
So you wait and watch for one more week. If you do not get periods by that time consult gynecologist once, get examined and take treatment accordingly.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429