Saggittal cross section of normal human embryo 35 mm long
This would be at approximately the very end of the first trimester, and the end of the stage of pregnancy where the gestating being is called an embryo. 
At this point of pregnancy, the tail of the embryo has disappeared. The intestines have just migrated from the umbilical cord into the embryo, the retina is fully pigmented (though the eyes are still closed), the brain has all its basic structures and will begin to rapidly increase in mass in a week or two, and the face is beginning to fuse together and look human.
A Study of the Causes Underlying the Origin of Human Monsters. Franklin P. Mall, 1908.

Saggittal cross section of normal human embryo 35 mm long

This would be at approximately the very end of the first trimester, and the end of the stage of pregnancy where the gestating being is called an embryo. 

At this point of pregnancy, the tail of the embryo has disappeared. The intestines have just migrated from the umbilical cord into the embryo, the retina is fully pigmented (though the eyes are still closed), the brain has all its basic structures and will begin to rapidly increase in mass in a week or two, and the face is beginning to fuse together and look human.

A Study of the Causes Underlying the Origin of Human Monsters. Franklin P. Mall, 1908.

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