Thanks for the query.
and strain, diet changes can affect the menstrual cycle by affecting the hypothalamo-pituitary-ovarian axis.
The pinkish discharge you are having may indicate starting of periods.
So you wait and watch for few more days, possibly by that time you will get your periods.
If not consult gynecologist once and get examined to find out the possible cause and take treatment.
If you had intercourse around the time of ovulation there is possibility of pregnancy
, if not no need to worry. After consulting the doctor you can get clarification regarding this.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429