1st Trimenon: Several publications on oseltamivir, including a multinational registry study of more than 1,000 women taking oseltamivir in the first trimester, did not show an increased risk of malformation. Oseltamivir was not teratogenic in animal studies.

2nd and 3rd Trimenon / perinatal: Previous observations speak against a foetotoxic risk.

Hopefully this paper is useful:

Seema Singhal et al. Clinical profile & outcome of H1N1 infected pregnant women in a tertiary care teaching hospital of northern India

Indian J Med Res. 2014 Mar; 139(3): 454–458.

so in fact you csn use oseltamivir in pregnancy. If you do not st be of anart it within the first 48 hours after first symptoms, it will not be of any help.

If you are pregnant or have given birth within the last two weeks and think you have the flu (influenza), call your health care provider right away. It's recommended that you take an antiviral medication, such as oseltamivir (Tamiflu), zanamivir (Relenza) or peramivir (Rapivab), as soon as possible. This type of medication, available by prescription, is most effective when taken within 48 hours of the first symptoms — although benefits are still possible if the medication is taken up to four to five days after symptoms start. Taking antiviral medications can prevent serious flu complications, such as pneumonia. Although it's important to be cautious with any medication during pregnancy, research suggests that the benefits outweigh the potential risks of antiviral medications to treat flu during pregnancy. Your health care provider might recommend oral oseltamivir because it has the most studies available to support its safety.