Really, it all depends on how much weight you gain.
If you gain 60lbs your a lil more likely to get stretchmarks and stretch your tatts.
But if you gain 20-30lbs, you MIGHT not get them.
I gained 60 for my 1st and got TORE up by stretchmarks. I gained 25 for this one and STILL got stretchmarks.
It's genetic really. NO amount of cream/oil will prevent stretchmarks. If your mom got them, you're likely to get them.
Do you have any pics of your tatts? The McCaw tatt sounds AWESOME!!
Sarah