8 weeks pregnant, or 6 weeks after conception: mobility

The embryo, now between 15 and 18 mm long, starts to move in the uterine cavity, although it is not yet possible to feel this movement. 

Fingers and toes begin to form, and several vital organs, such as the stomach, intestine, pancreas and kidneys, appear, although they are not yet functional. The nose and upper lip have formed, and the olfactory pole (the sense of smell) begins to develop. The trunk and neck begin to straighten.