Thanks for your query.
L tablets sometimes reduce menstrual flow, and occasionally might cause you to skip a period or two.
so do not worry, as long as you have been regularly on the birth control .
also, the pills are more than 99 % effective in preventing a pregnancy
Please take a pregnancy test to rule out the rare possibility of pregnancy.
Otherwise do not worry, as you would have your period eventually.
Continue taking the birth control regularly or use protection meanwhile.