Many abortion protest pictures are artist’s renderings or the result of image manipulation, and most photos of aborted fetuses are of very late-term fetuses aborted for emergency medical reasons. The vast majority of abortions are performed during the first trimester, often before the 6th week of pregnancy when the embryo is only about 15mm long. Anti-abortion photos of aborted fetuses are also false because they are hugely magnified, and  completely erase any sign of the woman. Further, the source of most of these photos are unknown and unattributed – many could actually be of miscarriages, stillbirths, or illegal abortions. Anti-abortionists have admitted to stealing fetal remains from hospitals and manipulating them for photos.

Early development of a pregnancy:
Up to 6 1/2 weeks from the first day of the last menstruation cycle, no embryo can be visualized yet, merely a gestational sac. A picture of a gestational sac in the fifth and the sixth week of pregnancy and a corresponding ultrasound image are shown below.

An actual early abortion:

Sources:

Gynmed Clinic, Methods of Abortion

rabble.ca, Why fetus porn doesn’t help the anti-choice cause (2013)