I would not risk it.
From http://www.rxlist.com/tamiflu-drug.htm
What are the possible side effects of oseltamivir (Tamiflu)?
Stop using oseltamivir and get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat; a red and blistering or peeling skin rash.
Some people using oseltamivir have had rare side effects of sudden confusion, delirium, hallucinations, unusual behavior, or self-injury. These symptoms have occurred most often in children. It is not known whether oseltamivir was the exact cause of these symptoms. However, anyone using oseltamivir should be watched...
Read All Potential Side Effects and See Pictures of Tamiflu »
What are the precautions when taking oseltamivir phosphate (Tamiflu)?
Before taking oseltamivir, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.
Before using this medication, tell your doctor or pharmacist your medical history, especially of: kidney disease.
Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).
During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.
This medication passes into breast milk. Consult your doctor before...
Read All Potential Precautions of Tamiflu »
------------------------
They say that the most common side effects occur in children. How much more so for a developing baby in utero? Your child is developing the very basic parts of his body, the brain, the neurological system, digstive system, eyes, ears, etc. I would not risk an interuption in this for my babies. They just don't know the long term effects.
Instead, up your Vit D, Vit C, sunshine. Cut out sugar, eat fruit and vegies. Be proactive in your health, not reactive.