Antimullerian hormone is only one of several factors used to measure ovarian reserve. We will have to take into account age, ultrasound (antral follicle count) and AMH (antimullerian hormone) along with other hormones that also guide us (FSH, LH estradiol). Therefore, the value of antimullerian hormone alone is not sufficient to define the ovarian reserve of a patient.
Between 1.2ng/mL and 3 ng/mL is considered a normal AMH. However, it is somewhat low for 23 years. For this reason, I would recommend you to extend the study and, if in doubt, to vitrify oocytes (freeze eggs) if you wish to postpone your maternity, in case the hormone value decreases later on.