Fetus The developing offspring from embryo to birth. A temporary, fluid-filled structure within the ovary that contains an ovum. The period of time in the menstrual cycle on the first day of menstruation and ends at ovulation. The period of development of the new organism from conception to the end of pregnancy and birth. Hormone A chemical substance that is usually produced and released by a gland.
Hormones circulate in the blood and affect different body functions.
The normal process in which the blastocyst becomes attached to the endometrium. In abnormal situations, the blastocyst may attach itself to the Fallopian tubes, or less frequently, to organs within the abdominal cavity, threatening the mother's life by haemorrhage when the placenta grows into a blood vessel. The phases of the menstrual cycle when pregnancy is least likely to occur. The appearance of bleeding, spotting or of a brownish mucus discharge between two menstrual periods. It may be associated with ovulation or may indicate the need for a medical assessment.