8 DPO TTC #2 Symptoms??? Or ill??

Just wondering if anyone has had these as symptoms because for the last 32 hours I've been thinking I have a stomach bug. I have the horrible stomach cramps, acid burning indigestion feeling and a couple of diarrhoea moments that you get when ill but I still have appetite and haven't eaten anything that could cause food poisoning. I had a good portion of grapes yesterday morning and immediately the pain and indigestion started so I thought, "oh over-indulged on grapes, oops!"... 32 hours later I'm not convinced it's grapes!! Any experience of this would be appreciated :) xx