At 4 weeks, no body changes are still visible. Your baby is now well attached to your endometrial lining and has become an embryo, which looks like a tadpole (it is the size of a sesame seed). The fourth week marks the beginning of the pregnancy. You may start noticing certain pregnancy symptoms at this point.
How does pregnancy look like at 4 weeks?
By Zaira Salvador B.Sc., M.Sc. (embryologist).
Last Update: 02/22/2018
Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI)