Hello, and I hope I can help you today. Pregnancy does not keep you, unfortunately, getting sick just like anyone else. The medication that your doctor recommended is not a treatment for sore throat, it will only help with making the pain feel better rather than curing the infection. I would attempt to use soothing treatments for your throat like her other form of hot liquids, lozenges (any type of lozenge is safe during pregnancy) and acetaminophen for the pain. If you are having severe difficulty swallowing or develop a fever greater than 101° I have concern that you could have a bacterial throat infection like tonsillitis. This type of infection can only be treated with antibiotics. There are numerous types of antibiotics that are safe to use in pregnancy, and I m sure your obstetrician would be able to prescribe one that is safe for the baby. I do not recommend continuing the diphenhydramine, unless you have a stuffy or runny nose. Diphenhydramine is generally used to treat allergies and will only make your throat dry. So I recommend you buy some throat lozenges, get adequate rest, drink lots of fluids, monitor your body temperature, and see how you feel after a few more days. If you develop fever greater than 101° work your symptoms start getting any worse, I suggest you see your doctor back or call and ask for prescription for antibiotics. Adult women can get strep throat, so you may need a culture for diagnosis. I hope that I was able to adequately answer your question, and that my advice was helpful. I hope you feel better, and best wishes for the rest of your pregnancy, Dr. Brown