Twins 12 week scan 😊 Gender theories?

Alicia • mommy to 5 beautiful girls 💜❤💗

had my 12 week scan..

today at 12wk 4days for my little beans and everything looked wonderful. Baby A is measuring 13 wks and 1 day with heart rate of 170 (I have a feeling he is a boy 😊) and baby B is measuring 12 wks and 5 days with a heart rate of 157 (thinking this is my girl) I would love opinions on gender based on nub and skull theory if you have them!