Hello mam, thanks for trusting health care magic.
In my opinion as your urine pregnancy
test is negative continue modus
for 5 days as prescribed and wait for periods.
in case you still dont get them then get a pelvic ultrasonography
done because it can be an early pregnancy or worse ectopic tubal pregnancy and then visit a gynecologist with reports
And from next cycle onwards start using a regular method of contraception
In case you have further questions you can consult me on health care magic forum and i will be happy to help
Take care and wish you all the best.
Dr Manisha Jain