Swelling at 28 weeks?

La

Is it normal for your ankles to swell at 28 weeks? The last week or so I’ve been noticing very mild swelling in my ankles when I come home and take my socks and work boots (I work 12 hr shifts at a jail) off. It goes away a few hours later and is completely gone by morning. No swelling in hands or anywhere else. If I wear flip flops, they don’t swell.