15 weeks!

McBaby is about the size of a navel orange now! McBaby now measures about 4 inches long, crown to rump, and weighs in at about 2 1/2 ounces. McBaby is busy moving amniotic fluid through her/his nose and upper respiratory tract, which helps the primitive air sacs in her/his lungs begin to develop. Her/His legs are growing longer than her/his arms now, and she/he can move all of her/his joints and limbs. Although her/his eyelids are still fused shut, she/he can sense light. If I shine a flashlight at my tummy, for instance, she's/he's likely to move away from the beam. There's not much for McBaby to taste at this point, but she/he is forming taste buds.

(info taken from babycenter.com)