Sorry, nasty personal Q, I know, but does anyone else find their need for a bowel movement is signalled by sudden really painful cramps apparently coming from their womb, together with a horrendous bout of nausea and sometimes a headache? I'm 5 weeks and this has just started happening. I have neither diarrhoea nor constipation; in fact, everything is normal bar the urge coming on very suddenly and painfully... 