Yea should be it will grow to the right size. Just ask midwive if your really worried but it should be fine. If it wasn't they would of said
The baby was only a few days behind but the sac was over a week behind! That's okay?
Hey I'm 27 going on 28th soon. But I had a lot of bleeding at the start for about over a month or 2 and had and early scan and first there was nothing in the sack so had to go back in another 2 weeks and same thing happened and after another 2 weeks there was a baby in it, and I was measuring smaller than I should of been, so what I'm trying say is don't worry babies can grow small then just get a growth spurt.