Stretch marks

If anyone wouldn't mind sharing, how far along were you with your little one before you got stretch marks? I'm just over 31 weeks and have only gotten a few on the inside of my breasts. I keep wondering if they will show up on my tummy or not but figured they would have made an appearance by now? I won't mind if I get them since they are something to be proud of but I won't mind not getting them either lol