Goldilocks - I dont really think there is a need to worry too much. If I remember correctly from my 1st preg' the same thing happened with me too and I have heard that it is normal and happens to many women.
Hopefully other ladies will share their stories too. Theres always comfort in numbers isn't there!
When we're pregnant we worry about everything! And believe me even once bub is born it doesn't stop. We become experts at it, lol.