Delayed menstruation refers to an irregular menstrual cycle in women, which may cause an increase or decrease in a woman's sexual desire, as well as the formation and implantation of a fertilized egg. For some women, delayed menstruation may prevent them from accurately calculating ovulation, affecting their reproductive health.

Generally speaking, a woman's menstrual cycle lasts 28 days, but most women's cycles are 28 or 30 days. Therefore, if you want to get pregnant, it is best to calculate a woman's ovulation period as follows:

1. Observe the menstrual cycle: A woman’s menstrual cycle usually has two cycles, namely short-term and long-term. If a woman's cycle is 28 days, then the short-term cycle is 14 days and the long-term cycle is 34 days. On day 14 of a short-term cycle, a woman's eggs begin to mature and prepare for release.

2. Measure basal body temperature: Measuring basal body temperature can help women calculate their ovulation period. When women wake up every morning, take their oral or anal body temperature. Generally speaking, during a woman's menstrual cycle, her basal body temperature will increase by 0.3-0.5 degrees Celsius. Basal body temperature usually reaches its highest level on day 14 of a woman's short-term cycle.

3. Use a pregnancy test stick: Using a pregnancy test stick can help women detect whether they are pregnant. Pregnancy tests usually contain a text message and a form that help a woman calculate when she is pregnant.

If a woman's menstrual cycle is irregular or if these methods are unable to determine when she is ovulating, it is best to consult a doctor. Doctors can help women calculate when they are ovulating and develop an appropriate reproductive health plan.