Did the doctor give you anything when you went?
Over Christmas I was ill for over a month, I had a terrible chest infection that they thought may have been pneumonia and tbh I still get quite 'coughy' days now.
On doctor's instructions I took paracetamol every 4 hours, drank honey & lemon, and used vicks vaporub on my chest and inhaled Vicks melted in hot water.
For 2 weeks, they wouldn't give me any antibiotics but then I took amoxicillin for a week (which didn't help at all, I got worse) before they gave me a different antibiotic that worked (can't remember which one)
I was so nervous about taking drugs in my pregnancy but honestly nothing else really made me feel any better. I would really recommend going back to the doctor if it's not clearing up as it is so hard for your body shift infection by itself when you're pregnant.
Oh, and unless the doctor says otherwise, don't use nasal sprays as they aren't recommended fro what I was told.
I hope something I've written is useful to you - I know how rubbish it is to feel so ill!