Stretch marks AFTER giving birth?

I’m 35 weeks and haven’t had any stretch marks (yet). I was hanging out with some child free friends with my belly out and one remarked about the absence. The other turns to her and says that I’m definitely going to get them and that they actually show up postpartum when everything shrinks back. I’m no stranger to stretch marks, I have a lot on my thighs and love handles after my growth spurt in middle school, but have literally never heard this before? She’s a bit of a know-it-all and says this stuff about pregnancy/child birth all the time despite not having experienced it, but is there any truth to this or has anyone experienced this?