CANT BELIEVE IT! Happy but worried!

Anna • I'm from England and I'm 25. Have a little girl who's 1 1/2 years old and after a year of trying were pregnant with baby number 3 due 8th September who is a boy (sadly lost our first) ❤
It's a boy, in complete shock we will now have one of each, baby's body was fine however the head is measuring quite small so gotta go see two consultants, trying to stay positive, has this happened to anyone?