I use the doctor palmers & did with DD aswell (no stretch marks from that PG) I only use it every few days but as the others have said I think if you're proned to them you will get them either way.

I have heard good things about bio oil helping to REDUCE stretch marks so maybe give that a go??

This pregnancy I've been losing weight & putting little bits on, so up & down. Still under my starting weight so I cant really say how much I've put on sorry.

I think from what you've said (drinking water etc) you're doing a good job of minimising your chances of stretch marks