Changes occur in the female body as soon as conception occurs, but these changes cause no physical changes until about one week after pregnancy. From that point until the end of gestation, physical changes can be felt throughout the pregnancy.

• 6 to 12 days after conception: Implantation of the fertilized egg may cause cramping.
• 7 to 14 days after conception: Breasts may feel swollen, sore, tingly and heavy.
• 7 to 14 days after conception: Fatigue due to increased progesterone, low blood sugar and low blood pressure.
• 7 to 14 days after conception: Increased estrogen and slowed gastric emptying may lead to nausea known as morning sickness.

The time frame in which women report feeling the first signs of pregnancy varies widely as different bodies change at different rates. Typically, the first signs of pregnancy are not recognized as being associated with pregnancy until after a positive pregnancy test or a missed menstrual cycle.