प्रसूति विज्ञान (obstetrics) में नैगेल के नियम (Naegele's rule) का उपयोग मुख्य रूप से किसका अनुमान लगाने के लिए किया जाता है?

For a woman presenting with occipito-posterior position, vaginal examination is performed immediately upon rupture of the membranes with an unengaged foetal head primarily to rule out:

All of the following are classic clinical cardinal signs or diagnostic components of pre-eclampsia except: