If the maturation and discharge of the egg (ovulation) does not occur naturally, it is possible to stimulate the ovaries to function properly. The easiest alternative is medication (clomiphene tablets), but if this treatment proves unsuccessful, hormonal injections are the next option. The FSH hormone is given in the form of daily injections; at the same time the maturation of the follicle is followed by ultrasound scans every two to five days. When the follicle is large enough, the actual ovulation may be triggered with another hormonal injection (HCG). The success rate of inducing pregnancy in this manner is between 10-15% per treatment, but often these treatments are carried out several times, which means that the likelihood of pregnancy also increases.