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Hi. My name is***** I'm sorry to hear about Leah's situation. I would agree that you should be concerned for her. Could she be pregnant? It is still possible. Could she have some other issue going on? That is also possible. In her situation, abdominal x-rays or an ultrasound can confirm / rule out if she is pregnant or not. IF she is, then she maya be having some pregnancy issues. If she isn't, then dealing with that directly needs to be done. Could she have an abdominal mass? Could there be fluid building up in her abdomen? Could fecal material be building up and causing a constipation issue? These are all possible issues. At home, all you can really do there is to try and tempt her to eat with various things that she may like. Some cats can go off food when impending labor is getting very close.
Getting back to the vet will be the absolute best thing to do. I'm hoping that everything turns out well. If she was defecating up until 2 days ago, then a constipation issue seems pretty unlikely.