You’re going to hate these answers:
It depends!
I felt my first earlier than this one, normal is 13-18 weeks.
I heard both babies heartbeats on ultrasound at 7-8 weeks, but never tried a stethoscope- the hope Doppler though, I heard my firsts at 13w I believe, but this one not until closer to 17w! I also found of the sex of my first at 13w but this one not until 18w. 😂I always thought each pregnancy everything happens earlier, but it’s not always true.