Tdap during pregnancy

OB is recommending tdap for my husband and I and I don’t know how I feel about it being pregnant. I have no idea how baby would respond to it but I’m so scared of baby getting whooping cough (due date is the end of February so during cold and flu season). Baby will be breastfed for immunities through breast milk and I have D drops but is there anything else I can do to help immunity and ensure me and my husband declining tdap won’t cause problems in the long run? My OV has been very respectful of my more natural views up until the conversation we had about this vaccine...