Or maybe your body is saying, "Sit down, I need a break!"
I had a 5+ month long plateau, so I totally relate to that feeling like this just isn't in the cards for me. I used to say the same thing - my body wants me fat. OK I still believe that it does LOL and it would if I let it.....but.......
I just say NO!! You will too! (As soon as you can without embarrassing yourself!) Honestly, I think that sort of accident would probably be harder to deal with than not losing as much or as quickly as I'd planned!!
I know what you're saying though. I sometimes have to force myself to take days off from the gym. I hate having to do that because I feel like I'm slacking AND even just after a couple of days off, sometimes it's hard to go back - despite how much I love it!! I can't figure that out!! I love it so much that sometimes I come home and want to go back! But my knees are usually like, "UHM NO WAY!"
FWIW, rest is OK - even required - sick or not! We don't have to be all or nothing! And, for me it was that "all or nothing" thing that got me in trouble in the first place!