6 week 4 day Ultrasound

I just got the call from the RE. They said I am still measuring about a week behind which they are not real worried about.. BUT... the yolk sac is a lil enlarged. This could be a few things. One thing is it could be just they way it was measured cause everyone one measures different. Or it could be a chromosome issue. Which could be why we haven't seen a fetal pole. So I am obviously hoping everything is fine and Tuesday will show the fetal pole and heartbeat and that this lil guy is fighting!! I am calling this lil booger a he.. Cause my IP's have 2 girls already LOL. Plus it takes a fighter to still be going. And this one is a fighter so far.. So He is gonna be fine and Tuesday he will prove that to us :)