Calf cramps while swimming

For the first time ever I experienced calf cramping about 3 miles into a 5 mile swim. Luckily I was in a pool. I am going to an OW 10K next weekend and am looking for some quick advice or what to do before a swim to avoid the cramps or what to do during if I (and hopefully I don't) experience them again and this time in OW. Thanks in advance. Sandy
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