Understanding Your Pregnancy

Pregnancy is generally dated using “gestational age,” in which day 1 of pregnancy is the first day of the last normal menstrual period (LMP). The ovaries are the female reproductive organs that produce eggs. During ovulation, an egg moves from one of the ovaries into the nearby fallopian tube.

During sexual intercourse, semen flows into the uterus through the cervix. The sperm contained in the semen travel through the uterus into the fallopian tube and surround the waiting egg. If the egg is fertilized, a new human life has begun. For the next eight weeks this human being is call an embryo.

The term of pregnancy is measured in three trimesters:

  • 1st Trimester | 1 – 13
  • 2nd Trimester | 14 – 26
  • 3rd Trimester | Weeks 27-40


Gestation: The period of development of the young from the time of conception until birth.

Ovulation: The release of the ripe egg from the ovary. The egg is released when the cavity surrounding it (the follicle) breaks open in response to a hormonal signal.

Semen: Fluid, containing millions of sperm, that is released through the penis during orgasm.

Zygote: The newly formed human being from the point of fertilization until the fifth day, at which point it will be calls a blastocyst.

Content taken with permission from the following informational pamphlet:
Unpregnant is not a word | © Frontlines Publishing 2011