It looks boyish - but I wouldnt bet more than a starbucks coffee on it. 15 weeks is a very tricky age. The scrotum isn't always obvious and/or it's hard to get a great picture of penis and scrotum at the same time.
So in my eyes, boyISH. 60/40
Thanks for posting . Have you ever seen a little girl look like this? Because I've been searching for pics of little girls with ambiguous nubs around this gestation and I couldn't find any. I have seen a few little boys who look like this, but most of them you can see a scrotum.