Because I'm an idiot, I kept going and finished my workout. I just omitted doing any lunges or moves that required me to bend my hip flexor. When I got back to the apartment, Chef helped input my symptoms into webMD and BAM! IT confirmed that I either strained or pulled my hip muscle. You might ask why I needed confirmation. Well, I'm still coming to grips with the arthritis that's primarily affecting my hip joint so it was a little hard for me to pinpoint if this was a joint or muscle issue.
So, I'm relegated to icing and aleve until the pain subsides. Bright side was that I got to sleep in this morning. Down side was that I was pretty sure that I was going to go over my calorie count. To that I say, tomorrow is another day.