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To tell you the truth, I need more information or examine the patient to come to an accurate diagnosis.
Differential diagnosis includes vascular problems for which we can consider a venous/arterial doppler.
Probable diagnosis is a pregnancy-related lumbar strain which is less likely.
We need to check for her peripheral pulses and also need to do some basic blood tests to check for any inflammatory markers.
She needs CBC (complete blood count), ESR (erythrocyte sedimentation rate), CRP (C-reactive protein), uric acid, calcium, RA (rheumatoid arthritis) factor, RBS (random blood sugar), RFT (renal function tests), vitamin D3, vitamin B12, and MRI (magnetic resonance imaging) of the lumbar spine (If required).
Firstly, we need to check if the leg pain is associated with any tingling or numbness. If her mild back pain with both side leg pain is associated with tingling and numbness, it could be a lumbar disc problem/herniation. For this, we need to consider a lumbar spine MRI (magnetic resonance imaging).
Secondly, if it is mainly leg pain, we can treat it conservatively with medications and physical therapy. So once the pain settles, she can learn pregnancy-related lumbar stretch and gentle back strengthening exercises from a good physiotherapist.
She can continue tablet Paracetamol 1000 mg twice a day one in the morning and evening after food times one week until the pain subsides. Consult your specialist doctor, discuss with him or her and with their consent take the medicine.
She needs to prevent lifting heavy weights, bending forward, jerky travel and strenuous work. She needs a firm bed mattress.
Followup depends on improvement. If she does not improve, she needs to consult a pain management or an orthopedic doctor.
For more information consult a pain medicine physician online --> https://www.icliniq.com/ask-a-doctor-online/pain-medicine-physician