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How Long After Your Period do you Ovulate?

Pinpointing ovulation is one of the most important things you can do when you’re trying to get pregnant. If you know when you ovulate, you can calculate your ‘fertile days’. Also known as the ‘fertile window’, this is the time when sperm can survive to encounter the egg and potentially fertilise it. Intercourse outside this period, when the average lifespan of sperm does not intersect with the fertile life of the egg, has a much lower chance of causing conception.

Finding when you ovulate helps you identify these fertile days. The egg, upon ovulation, has a much shorter lifespan than the sperm. After it’s released from the ovaries, an egg is fertile for no more than 24 hours. Sperm, on the other hand, can survive in a woman’s reproductive system for an average of five days. This gives you a six day fertile window.

One of the most basic ways to identify when you’re going to be fertile is to track your cycle on the calendar – apps make this a little easier and more responsive than simply using a paper calendar. If you know how long each phase of your cycle is, you just need to mark the first day of full bleeding in your period. You can then count forward from your period to find the time when you’re at your most fertile!

Phases of the Menstrual Cycle

Your menstrual cycle is broken into two main parts – the follicular phase and the luteal phase. Today we’re concerned with the follicular phase. This is so called because at the beginning of your cycle, at the same time your period begins, your ovaries begin to mature between five and twenty eggs in small sacs called follicles.

This phase can last between eleven and twenty-seven days, with the majority of women experiencing a sixteen day follicular cycle, which ends in ovulation. Some women have a very regular cycle, ovulating at the same point every time. Others have a much more variable cycle length.

Finding When You Ovulate

To determine the length of your follicular phase, you can use a Basal Body Temperature thermometer to reveal the small changes to your core temperature overnight that can show when you’re going to ovulate.

OvuSense makes this fertility tracking method easier to use, with an automated, overnight temperature sensor that links to an app to give you results and predictions of when you’re going to be at your most fertile.