It's important to note that many women do not have regular cycles.

If you have a regular 28-day cycle, count back 14 days from when you expect your next period to start.

At the start of the treatment 390 women reported having regular cycles (less than four days difference on average).

It is an active town, with a regular cycle of festivals and activities.

It was one of the reasons that ships had to have a regular down cycle in port.

The regular cycle of studies encompasses learning in basic school subjects.

I have always had regular cycles so this was very strange.

During these experiments the people slept and woke on a regular cycle.

Do you have regular cycles, such as a period every 25 to 35 days?

The net developed a regular cycle of interacting with Richard.