Thanks for the query.
I understand your concern.
Little bit of irregularity in periods can occur due to many causes.
Usually menstrual cycle with length of 21 days to 35 days should be considered as normal only.
Ovulation kits can identify fertile period, after crossing the fertile period you may not able see the darker line.
As your urine pregnancy test kit gave negative result, better to wait for one more week and possibly you may get periods by that time.
If not, consult your doctor and take tablets to induce withdrawal bleeding.
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.