Pics aren't very clear but from what i can see, i would say boy. The 12 week nub theory thing isn't always very accurate though anyway.
If your really keen to know soon, rather than wait until the 20 week scan, have you considered the urine gender predictor test ? People have mixed feelings about the accuracy but it's supposed to be over 95 % accurate if done properly. I used it for a bit of fun with all 3 of my kids (including this one) & it was correct every time
I forget exactly what they are called (brand) but i bought mine online for around $60, you can use them from around 10 weeks. They say don't go & paint the nursey after you get the results as they are really meant to be a bit of fun but they were correct for me each time