During my first trimester, I thought I might get away with continuing to wear my low-slung hipster jeans for the duration. And I probably could have eeked them out for way longer than I did, had I invested in button extenders or a Bump Bandeau (as recommended by JTryner in an earlier thread). But there was always going to come a point when I got a little larger all over (be it from swelling, fat or, y'know, the extra 2 ½ pints of blood that swishes around in women when they're growing a foetus).
If you've ever been pregnant, you know that maternity jeans can be a real saviour for your wardrobe. As your waistline expands, everything starts to not fit quite so well (sob!), and it can get uncomfortable—not to mention expensive. But if you have some decent denim options at your disposal, you can at least wear some of your looser tops over your bump. And there are some brilliant jeans that can help with that.