Cant understand why no-one else has replied to this? I hate seeing posts unanswered especially when someone is just looking for reassurance?
I think its nornal for you to have worries even at such an early stage and to be honest like most mums-to-be including myself to you will worry all the way through right up until your child is born until you are able to see for yourself that everything is ok! Believe me your not off your head just a concerned parent to be.