If you're looking for a quick answer, then no, you should not swim after getting a piercing. According to NHS, "you should avoid swimming for at least 24 hours after having a piercing, and ideally until it has healed properly." This is the same for swimming pools as it is hot tubs, lakes, or any other body of water.
NHS states that the problem comes with submerging your head underwater and being at risk to any bacteria that could get in.
To put it simply, you want to keep it dry until the piercing has healed, which takes anywhere from eight weeks to a year, depending on what you've had pierced (via Healthline). The full breakdown, according to NHS, is that ear piercings take six to eight weeks, belly button piercings take six months to a year, and nose piercings take up to six months. That makes the cold-weather months a great time to be spontaneous. (Unless, of course, you plan to go on a winter vacation.)
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