19 week scan need a follow up 😞

So i had my 19 week scan today and they said I had to come back in a week cos they couldn’t see the spin as developed as it needs to be and couldn’t rule out spina bifida.. but everything else like brain and that looks healthy. Just im measuring a week behind.. which i have said all along i was a week behind wat they were saying cos i knew when I ovulated.. should i be worried.. she didnt seem worried said if i was a week behind made sense.. but its hard not to :-/

But we confirmed its a Baby Boy :-) we are very happy 😃