Activity data not fully synced to new phone

I upgraded my phone a few days ago from my iPhone 7 to the iPhone X. I set up the new phone by using my current 7s most recent back up (an hour before setting up). Whilst it appears to have lost a number of phone numbers, I have managed to resolve this. However the activity app seems to only have the last 37 days of data (35 days at the point of setting up the new phone). I have had my Apple Watch for over a year but it’s lost all data from before 28th April!? This means I’ve also lost a lot of awards if previously earned. Can any one shed any light on how to resolve this?

Thanks

Sarah