On top of my incredibly debilitating baby bump, my left knee cracked once and tried to crack again…

On top of my incredibly debilitating baby bump, my left knee cracked once and tried to crack again but wouldn't - leaving me unable to bend it at all without crazy pain. I really don't feel like going to the hospital or anything because it doesn't look swollen (to me) and last time I went they sent me home 🙄 I don't know what to do.