No it's a myth. My mom and aunt said basically the same thing to me, saying i could wrap the cord around it's neck. So me not believing them asked my midwife and doctor and they said it's not true. Cord wrapping around the neck depends on baby's movement, not yours and it isn't as common as it seems
I wasnt playing playing I just hit the ball. But I also just ate so maybe that's why I felt bubbles.
No you won't choke the baby... But you also shouldn't be playing volleyball because you could get hit in the stomach pretty hard