I’m actually going to say girl for some reason 🤷♀️ The nub looks like it could be parallel to the spine but it’s hard to tell because baby is curled up a bit. In my boys 12 weeks scan he was lying very flat and there was a clear nub angled up. The other thing is you don’t say what gestation you are, if you are 13 weeks I’ll stick to the girl prediction but if you’re closer to 11 or 12 weeks there’s a good chance that nub might be on the rise 😂