Please see a doctor soon to check for a chest infection and ensure your symptoms are not affecting your pregnancy. You can safely use paracetamol for your headache and try saline nasal drops or steam inhalation for congestion. Do not use over-the-counter cough syrups or decongestants unless prescribed by your doctor, as some may not be safe during pregnancy.

An evening fever around 100F with one-sided back-to-knee pain that appears during fever may be due to a viral infection with body aches, muscle inflammation, or sometimes nerve-related pain (like sciatica) that worsens when the body is inflamed. You can take paracetamol for fever and pain, rest well, and stay hydrated. If symptoms last more than 3-4 days or worsen, consult a doctor.

Lower abdominal pain can have many causes, such as gas, constipation, urinary infection, menstrual issues (in women), or intestinal infection. For mild pain, try drinking plenty of fluids, eating light meals, and avoiding spicy or heavy foods. A mild antispasmodic or paracetamol may help if suitable for you. However, consult a doctor for proper examination and tests to identify the exact cause and receive appropriate treatment.