Gmail's spam filter is good, but not perfect. If you've got a sneaking suspicion there might be a false positive, shoulda-seen-it email trapped in your Spam bin, the Digital Inspiration blog suggests a quick search to find it.
Using a combination of Gmail's search operators and "OR" combinations, Amit Agarwal suggests a quick search that runs through your Gmail spam to find any messages directly address to you that don't start with "DEAR SIR/MADAM." Head up to the search bar (or tap the / shortcut) and enter a personalised version of this string:
in:spam to:me "Hello Kevin" OR "Hi Kevin" OR "Dear Kevin" OR "Hey Kevin"
I added the "Hey" greeting to Amit's suggestion, because I find a lot of email senders using that informal intro more and more these days.
Hit the link for Amit's explanation of how this string works, and how you can expand it to catch more missed messages, and leave your own spam-reclaiming search suggestions in the comments.
Scan the Junk Folder in Gmail for any Important Emails [Digital Inspiration]