Nub Theory Help- Twins!

The first tech said she thought based on nub theory they were girls. Then the doctor guessed boys. Then another tech did an ultrasound today and said one has a long nub, so she's thinking boys. But the other baby has nothing but a very tiny, downward pointing nub lol

They Identical, so they should both be the same gender.

If there's a Long nub, but it's horizontal, are they still boys?

13 weeks exactly!