An enlarged thyroid may be an indicator of an underlying thyroid problem involving abnormal production of thyroid hormone. This can disrupt menstrual cycles and ovulation, thereby interfering with fertility.
The term gonadotropin refers to compounds that directly stimulate the ovaries. These medications are generally combinations of follicle stimulating hormone (FSH) and luteinizing hormone (LH) or pure FSH.
Human chorionic gonadotropin (HCG) has a chemical structure that is very similar to luteinizing hormone (LH), which triggers ovulation. HCG is also the hormone produced by pregnancies from the chorionic villi and placenta.