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When is the implantation of the fertilized egg noticeable?

By Marta Barranquero Gómez B.Sc., M.Sc. (embryologist).
Last Update: 12/11/2025

The most characteristic symptom of embryonic implantation is usually brief, occasional bleeding—that is, implantation bleeding. However, this spotting doesn't always occur, as it only happens in approximately one-third of pregnant women.

Additionally, the woman may also experience discomfort such as breast swelling, fatigue, increased frequency of urination, etc. Even so, these symptoms are very general and can be confused with premenstrual symptoms. Therefore, the only way to confirm if a pregnancy has occurred is by taking a pregnancy test after a missed menstrual period.

 Marta Barranquero Gómez
Marta Barranquero Gómez
B.Sc., M.Sc.
Embryologist
Graduated in Biochemistry and Biomedical Sciences by the University of Valencia (UV) and specialized in Assisted Reproduction by the University of Alcalá de Henares (UAH) in collaboration with Ginefiv and in Clinical Genetics by the University of Alcalá de Henares (UAH).
License: 3316-CV
Embryologist. Graduated in Biochemistry and Biomedical Sciences by the University of Valencia (UV) and specialized in Assisted Reproduction by the University of Alcalá de Henares (UAH) in collaboration with Ginefiv and in Clinical Genetics by the University of Alcalá de Henares (UAH). License: 3316-CV.