Ovulation takes place 14 days before your period, with more or less 3 days in between. Late ovulation, therefore, extends the total length of the cycle likely lasting more than 28 days. Conversely, early ovulation always occurs 14 days before your period, but this simply indicates that your cycle will be shorter than the average 28 days! It is therefore the length of the first part of the cycle that is variable, with the ovulation period always occurring at the same time overall. Once again, this is completely normal: menstrual cycles vary according to every individual. It is important to know that ovulation can exceptionally occur outside of the 14 days before your period, and it is even possible to have a month without ovulation!