Some women have irregular menstrual cycles and don’t produce an egg each month. This is called anovulation and is usually due to the woman having polycystic ovary syndrome (PCOS). Other causes include stress, weight loss or weight gain, or excessive production of a hormone called prolactin which stimulates milk production in the breasts.
Anovulation is the commonest cause of infertility and the easiest to treat. The treatment is call ovulation induction and the aim is to restore ovulation in the most natural way possible. It involves the woman taking fertility drugs, either in the form of tablets or injections, to help the ovary produce and release a single egg each month. Injections are only used if there is no response to the milder tablet drugs. The response to the medication is monitored with a series of ultrasound scans in the first half of the cycle (follicle tracking) and a hormone blood test for progesterone 7 days after ovulation