How soon after implantation can you feel sick?

After implantation, which typically occurs about 6 to 10 days after conception, some individuals may start to experience early pregnancy symptoms, including nausea or sickness, within a week or so. This is often due to hormonal changes, particularly the increase in human chorionic gonadotropin (hCG). However, symptoms can vary widely among individuals, and not everyone will feel sick early on. Generally, most women report nausea starting around the 6th week of pregnancy.