I have started my 19th week. Almost halfway there.
The baby is supposed to be about 6 inches long now. Pretty amazing to think that there is something 6" inside of me and weighs about 8 1/2 ounces.
Next week the baby should be about 6 1/2" long and 10 1/2 ounces.
They measure the first 20 weeks from the crown to the rump -- so in actuality, the baby is longer than 6".