There is no better way to protect your baby from whooping cough in the first few weeks of their life than the vaccination. The immunity you get from the vaccine will pass to your baby through the placenta. The placenta is on the inside of your womb and links your blood supply with your unborn baby.
Your protection (from either having whooping cough or being vaccinated when you were young) may have worn off. Even if you are planning to breastfeed, not enough protection against whooping cough is passed on in the breast milk to protect your baby.
Getting vaccinated lowers your risk of being infected with whooping cough and the risk of passing whooping cough on to your baby.