Irregular cycles and trying to conceive: what they can mean and what to do

Your friend says she ovulates on day 14 like clockwork. Your app keeps apologising for “unusual cycle data”. Your last three cycles were 29, 41 and 35 days. If that sounds familiar, you are not broken, and you are not alone. Irregular cycles are common, and there is a lot you can do to understand them.

What counts as irregular?

Every body varies a little, and a few days' difference from month to month is normal. Your cycle may be worth a conversation with your doctor if:

• Your cycles are often shorter than about 21 days or longer than about 35 days.
• The length changes a lot from one cycle to the next.
• You go three months or more without a period and you are not pregnant.
• You bleed between periods or after sex.
• Your periods are very heavy or very painful.

Why irregular cycles matter when trying to conceive

The variation in cycle length usually happens before ovulation. So irregular cycles often mean ovulation comes at unpredictable times, or sometimes does not happen at all in a particular cycle. That makes timing harder, and if ovulation is infrequent, there are fewer chances to conceive each year. The good news is that many causes can be identified and helped.

Common reasons for irregular cycles

• Polycystic ovary syndrome (PCOS): one of the most common causes. It can involve irregular or absent periods, signs of higher androgen levels such as extra hair growth or acne, and many small follicles on scan. Not every woman with PCOS has every sign.
• Thyroid problems: both underactive and overactive thyroid can affect cycles.
• Raised prolactin: a hormone that, when high, can interfere with ovulation.
• Stress, illness and big life changes: a bereavement, a move, exams or a demanding job can delay ovulation.
• Weight changes and intense exercise: both very low body weight and higher body weight can affect hormones, as can very heavy training with too little food.
• Recently stopping hormonal contraception or breastfeeding: cycles can take time to settle.
• Approaching perimenopause: cycles may change in your late thirties and forties.

What you can do this month

1. Keep a record. Write down the first day of every period, plus anything unusual. A few months of dates is very useful to a doctor.
2. Watch your body's signs. Cervical mucus and temperature can show you whether and when you ovulate, even when cycle length varies.
3. Don't rely on app predictions. They work best for regular cycles.
4. Aim for regular closeness every two to three days, so timing does not depend on guessing.
5. Look after the basics: regular meals, sleep, gentle movement and stress care. These support hormonal health generally.

When to see your doctor

If you have irregular cycles, you do not need to wait a full year of trying before asking for help. Mention it as soon as you start trying, or sooner. Your doctor may arrange blood tests for hormones, thyroid and prolactin, and a pelvic scan. If you do not ovulate regularly, there are treatments that can help, but these must always be prescribed and monitored by a doctor.

See a doctor promptly if you have no periods for three months or more, very heavy bleeding (for example, soaking through protection every hour or two), bleeding after sex, or severe pain.

A word for the frustrated heart

It is wearying to feel that your body will not keep to a timetable. You might even feel betrayed by it. Scripture gives us a tender picture of how God sees our bodies: “For he knoweth our frame; he remembereth that we are dust” (Psalm 103:14). He is not disappointed in your hormones. He understands every part of you, the regular and the irregular, and He is patient with you. You can be patient with yourself too.

A prayer for an unpredictable cycle

Lord, You know my body better than any chart. When my cycle feels unpredictable, help me to rest in Your steadiness. Lead me to wise care, give me patience with myself, and remind me that my value never depends on how my body behaves. Amen.