Sounds like you just got a bit of cervix irritation maybe from the transvaginal probe.
Often symptoms are different with subsequent pregnancies. Also mybe it is a different sex baby.
My first pregnancy I was sick from day one but had no cramping or sore boobs.
Now I am pregnant again (but this will be my first baby

) and i've had no sickness but really sore, heavy boobs and cramping like bad period pain.
Best way to set your mind at rest would be to go back to your doctor and explain your worries.
Hope evrything goes well and you keep us up to date.