They both could be used, but in the case of (1), this seems a slightly more natural word order for me: I took my umbrella with me when I left home, just in case.
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teacherJapan Thank you!!! Should I use a comma after "home" or can I just omit it?I think it is best to include it. It makes it visually clearer that "just in case" does not apply to "I left home". Opinions about its necessity may vary though.