Nub theory anyone?

Morgan ✌🏼️❄️ • 28, married to a wonderful husband, expecting our 2nd!
I'm 13 weeks and at our ultrasound, they told us they are thinking boy based on the "angle of the dangle". I'm not putting too much stock into it until the 20 week anatomy scan, to be safe.  Have any of you been told a gender based on this theory, and have it be correct/wrong? ?? Here's our US.