Thanks for the query.
I understand your concern.
Minor variations in menstrual cycles can be seen due to many causes.
As your blood test for pregnancy is nnegative, there is very less possibility for pregnancy.
Pink discharge you are having is possibly indicating premenstrual spotting, which may turn into regular menstrual flow soon.
And cramping etc may also indicating onset of periods.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.