You can expect to have a period-like menstrual bleed in the 7 day break you take after your 21 day pack is over. However, you may notice that your periods may be lighter or heavier than they used to be before taking Ovral L. If you miss a period on Ovral L after taking it for a while, try not to worry. This can happen when the uterine lining is so thin that there is nothing to shed.[popover id=ref4] You should still take a pregnancy test, though. Just to be sure.