At home fetal Doppler

Haley
Does anyone else have an at home Doppler? I just bought one. And want to use it all the time, but don't know if that's okay. Lol online it says you can use it daily. I just feel maybe that's hurting the baby. 
Also any guesses I am 14+5 baby's heart rate is 133 boy or girl??? 
We find our April 2nd! I'll be 18 weeks.