It must be so frustrating not knowing for sure! I have two boys and am having a girl this time, I definitely saw three lines at the 20 week u/s and like you, I know what a boy looks like at an u/s LOL!

My pregnancy has been different this time - I didn't get m/s like the other times, I don't have the big dark line down my belly this time, etc. But like Mbear said, different symptoms this time doesn't necessarily mean it's a different gender. Hopefully you're having a girl too, although boys are so awesome and three brothers would be so lovely .

Do you have any u/s pics you can post that give clues to the gender? There are some girls on BB that are great at guessing correctly