Thanks for the query.
I understand your concern.
A little bit of irregularity in periods can occur due to many causes.
Sometimes menstrual flow can start as spotting or brown discharge and can turn into normal flow.
So, better to wait for few days.
If spotting persists and if you are having doubt regarding pregnancy, please go for urine pregnancy test two weeks after intercourse to find out the possibility of pregnancy.
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.