Predicting Baby's Sex

So, today is the day of our ultrasound.  Neither Jen or I are good with keeping things a surprise, we're also both fairly type-A and like to be prepared, so we didn't even really have to think twice whether we'd find out the baby's sex.  (We'll tell you as soon as we know. ;) )

I've gone back and forth in thinking of this baby as a girl or a boy.  Right now I'm leaning towards thinking it's a boy mainly for two reasons:
1) It was explained to us by another lesbian mother that the way they time IUIs, the chances of conceiving a boy are higher.  (They are timed to happen AT ovulation, and XY sperm swim faster.)
2) The heart rate is low, and it's an old wives' tale that low heart rate = boy.  Sprout's last check up had him/her clocking in a 144bpm, and according to lore below 140 indicates a boy, but to me 144 seems close enough. 

Just for fun, here are some other old wives' tales for predicting sex: 
-If you're carrying low, it's a girl.  If you're carrying high, it's a boy. 
I think I'm carrying high.
-If your linea nigra only goes up to your belly button, you're having a girl.  If it goes up above your belly button, it's a boy.
No line yet.
-If your left breast is larger, you're having a girl.  If your right one is larger, you're having a boy.
I refuse to say. 
-If you break out, you're having a girl.  If your skin is clear, you're having a boy.
I've probably been slightly less broken out than usual.
-If you are experiencing severe pregnancy sickness, you're having a girl.  No sickness, you're having a boy.
I felt pretty wretched for a while.  Medication helped.  The past few weeks I haven't been taking any pills and don't feel 100%, but certainly don't feel as bad as I did before.  Except for this morning when I vomited all over myself.  It was about as lovely as it sounds. 
-If you crave sweet foods you're having a girl.  If you crave salty or sour foods you're having a boy.
I'm probably craving more sweet than salty foods, but that's usual for me.
-If you pee on baking soda and it doesn't fizz you're having a girl.  If it fizzes, you're having a boy.
Didn't do this one.
-Take a ring, attach it to a thread and have someone hold it over your belly.  If it swings in a circular motion, you're having a girl.  If it moves back and forth, you're having a boy.
Or this one.
-A Chinese Calendar will predict the baby's sex based on your age and the month your baby was conceived. 
Or this one.

I think I come out neutral based on those "predictors", but either way, I'd have a 50/50 chance of being right. 

So, what to you guys think, is The Bean going to have a little sister or a little brother?