anyone fell very sick while pregnant?

I fall sick when I am week 11/12 bad coughing, then come phlegm, almost 2 weeks still slightly coughing, i only took polyclinic medicine lozenges and 2 times of cough syrup and after that no recover went to see gyna for medicine and recover but i didnt want to take a lot of medicine too. till date slightly better but still cough wif phlegm. didn't took flu vaccine maybe will consider in future