Cefpodoxime is a kind of penicillin. Animal studies have shown that it does not cause any harm to the unborn baby. However, due to ethical reasons similar tests cannot be done in humans. Therefore its safety in human pregnancy has not been established. This does not mean that it is unsafe. There is absolutely no reason to terminate pregnancy. Just for the sake of abundant precaution and peace of mind, the development of baby should be followed through serial ultrasound examinations.
Cefpodoxime is a reserve medicine - not first line treatment for respiratory infections. We only use it for either recurrent or chronic respiratory tract infections that do not respond to other antibiotics.
Most acute respiratory tract infections in India are due to viruses for which no medicine works except time.
Incidentally Doxinate is not an antibiotic but a medicine to stop nausea and vomiting of pregnancy. Your wife got alright on her own, certainly not because of Doxinate.