@yellowrose006,
What country AND century are you from? Did you forget where you parked your time machine?
Unless the woman in question is a minor or is legally considered mentally handicapped, in the US and many European countries, an adult female can sign legal documents of all sorts no matter her status of being pregnant or not.
Also, she can vote and own property as well. In Massachusetts, a woman has even been pregnant while being governor of said state, (Jane Swift). She must have had to sign many legal documents during her tenure in that office.