Winoows Mail: No Junk Mail

Over the weekend, my Windows Junk E-mail Folder mysteriously started not filling up. On a usual day, I used to get maybe 20-30 pieces of spam, and they were always smoothly sent off to the Junk E-mail Folder. Now at times there is no junk mail or, when there is, there are only 4 or 5 pieces at a time. Normally I'd be thrilled not to be inundated, but occasionally mail is sent mistakenly to the Junk E-mail Folder, and I'd like to be able to retrieve it if necessary. So: Am I in fact receiving junk mail but it's just not "registering"? If so, how do I get to see it again, like I always could before? I notice that the Junk E-mail folder itself now has a small red slash-in-circle on it. I don't recall seeing that before this behavior. Is it related to my issue and, if so, how do I set things right?