Boys and girls ca hae forked nubs.
Hard to be sure with this one. For a boy a would have expected a bigger angle at this stage, for a girl I would have expected it to be flatter at this stage.
I'm guessing it's a boy! But......a nub is not ever 100% and this one gives much room for error guessing so it really might just be a tricky girl. Maybe look at in-gender at the "confirmed girl nubs" and then you will find nubs just like yours.