Early pregnancy symptoms can begin to appear as early as one to two weeks after conception. Common early signs include:

• Breast changes such as soreness, tenderness, or darkening of the areolas, which may start around 1-2 weeks post-conception.
• Spotting or light bleeding caused by implantation of the fertilized egg, usually about 6 to 12 days after fertilization.
• Feeling tired or fatigued due to hormonal changes.
• Nausea, often known as morning sickness, which typically begins a few weeks after conception but can start earlier in some cases.
• Frequent urination caused by increased blood volume and kidney activity.
• Heightened sense of smell and food sensitivities.

Most symptoms become noticeable around 4 to 6 weeks into pregnancy for many people, around the time of a missed period. However, some women report mild symptoms as early as 4 days after ovulation, though this is less common and these early symptoms can be similar to menstrual cycle symptoms. Therefore, the earliest pregnancy symptoms can appear within about one week after conception, but more commonly symptoms appear 2 to 4 weeks after conception or around the time of a missed period.