Hello Good Evening,
This might be either implantation
bleeding or pill side effect bleeding:
Implantation bleeding – a very early sign of pregnancy
– occurs when the fertilized egg attaches to the uterine lining.
During implantation, the fertilized egg (called a blastocyst
at this stage of development) burrows and embeds itself underneath the wall of the womb (uterus
Because the uterine lining is rich with blood, some women can experience spotting and even cramping during this process.
For the most part, implantation bleeding is lighter and occurs earlier than your regular menstrual period. Sometimes, however, implantation bleeding may be heavier, so it can be easily confused with a regular period.
So both the possibilities are there, so you should wait for next 5-7 days and get urine pregnancy test done.
Dr. Naresh Jain.