A pregnant woman during a bank robery

[translated from dutch, sorry if anything is translated wrong]
A pregnant woman goes to a bank to collect the money for the ultrasound she is gonna have soon, when all of the sudden the bank gets robbed. 3 armed guys run into the bank shouting everyone to get down. The woman, being pregnant, can't get down that easy. One of the armed guys panics and thinks she is resisting, so he shoots her and hits her multiple times in her belly. Thankfully, the woman survives, and she gets rushed to the hospital. After everything seems fine, the doctors decide she should have her ultrasound. The doctor see's that she is gonna give birth to 3 children 2 girls and 1 boy, BUT, they all have been hit by a bullet. However, the doctor thinks that it'll be fine and at some point of their lives, the bullets will come out.
So, a few years later, one of the girls comes crying to her mother "Mommy, I just peed and when I wanted to flush the toilet, there was a bullet in the water" so her mom calms her down and explains the Bank robbery story. After this the girl is calmed down but still a bit worried. A few weeks later, the other girl comes running and crying to her mom. Before she can even speak, her mom says "let me guess, you went to the toilet and found a bullet?" "yes mommy, how do you know?" and to her, the mom too explains the armed robbery story. But then a few months later the boy comes crying to his mom, so before he can speak she says "let me guess, you were doing some business in the toilet when there was a bullet inside of it?" "NO" the boy replies, "I was jerking off and all of the sudden I shot our dog"

EDIT: Changed echo to ultrasound