guess the sex πŸ’– or πŸ’™

AE ❀️ β€’ Boy mom πŸ”Ή wife πŸ”Ή thrive promoter
Just a little fun guessing game - I got my first US at 13 weeks exactly (last Friday) The heart rate was 149. What do you think? Based on HR, skull theory or other old wives tale.Β 
Disclaimer - this is for fun! I am finding out the gender in 4 to 6 weeks. Thank you πŸ’–πŸ’™