The pus cells in urine indicates urinary infection.
She will need treatment for urinary infection including antibiotics.
She need to consult her gynaecologist, so that she can prescribe her antibiotics which are safe in pregnancy
and at the same time will effectively cure her infection.
She needs to drink plenty of liquids orally.
If she has taken antibiotics previously and was not treated, I would suggest to get a urine culture sensitivity test done to find out the causative organisms and the effective antibiotics.
If the treating gynaecologist feels so, then she can have an opinion from urologist
Hope this information is helpful.
Dr. Mrs. Sumeet Baheti