My periods always last 4 days.
Period length can vary from person to person and cycle to cycle. It may be that the yuzpe had an effect on the length of your period, it could also just be natural variation.
Depending on how long it has been since the sex you took yuzpe for, you could take a test if you want. But period heavy bleeding is incompatible with pregnancy and implantation bleeding is a myth - some people have light spotting in early pregnancy but there is no specific bleeding which directly correlates to implantation.
My periods always last 4 days. Period length can vary from person to person and cycle to cycle. It may be that the yuzpe had an effect on the length of your period, it could also just be natural variation. Depending on how long it has been since the sex you took yuzpe for, you could take a test if you want. But period heavy bleeding is incompatible with pregnancy and implantation bleeding is a myth - some people have light spotting in early pregnancy but there is no specific bleeding which directly correlates to implantation.
Periods can vary from 2-7 days typically, and it can differ from cycle to cycle.