Thanks for your query.
What you have sounds like an upper respiratory tract
You are doing everything that should rightly be done, just add taking warm saline gargles also for your sore throat
you need to consult a SPecialist, as this problem is persisting for a few weeks now, by which, it should have run its course.
You might need antibiotics / further intensive treatment, and that too, specially tailored to your first trimester of pregnancy