My DD1 was born at 38w1d...

I would probably in your case think also about finding a doula that will be there for you and your partner in the lead up to birth as well. So many emotions can and do come up and it is nice to have a strong bond with that person going into labour. if they are not going to be available to you during your pregnancy it might not be quite the relationship that you need ITMS.

But this is just my

and as for size of bubs, no. DD1 measured behind and was born 2 weeks early. DD2 always measured ahead and was born on her EDD.