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Basal body temperature: Your lowest body temperature in a 24 hour period

Body mass index: A measure of body fat based on height and weight

Cervix: the lower part of the uterus in the human female reproductive system

Cervical mucous: A natural lubricant which is produced by the female body to help the transportation of sperm. This can also help to protect against infection.

Conception: The moment of fertilization when the sperm meets and penetrates the egg

Cycle length: The number of days from the day your period starts (note this as day 1) to the day before you next period starts

Estrogen: A female sex hormone produced primarily by the ovaries

Embryo: An early stage of development of a baby in the womb

Endometriosis: The presence of endometrium outside the womb

Folic acid: A B vitamin that is important for cell growth and metabolism

Fertile window: A six days period of time, commencing five days before ovulation and including the day you ovulate

Fertility lubricant: A lubricant that can be used to help both of you conceive

Hormone: A chemical messengers produced by the body that transmit instructions from one organ to another.

Human chorionic gonadotropin: a hormone produced in the human placenta that maintains the corpus luteum during pregnancy

Infertility: The inability of a sexually active, non-contracepting couple to achieve pregnancy in one year

Luteinizing Hormone (LH): A pituitary hormone that stimulates the gonads. In a man, LH is necessary for the production of sperm and testosterone. In a woman, LH is necessary for the production of oestrogen.

Menstrual cycle: The process of ovulation and menstruation in women and other female primates

Neural Tube Defect: A birth defect of the brain, spine, or spinal cord which happen in the first month of pregnancy, often before a woman even knows that she is pregnant

Ovulation: The release of the matured egg or ovum from the ovarian follicle

Scrotum: The pouch of skin below the penis, which holds the testicles or testes

Semen: The fluid released by the penis during orgasm, which helps transport sperm manufactured in the testicles

Sperm count: The number of sperm contained in an ejaculate. Also called sperm concentration and given as the number of sperm per millilitre.

Vaginal dryness: When the vagina does not naturally produce enough natural lubricant