I had a whooping cough vac the day after DD was born, and dh got his a couple of weeks before she was born. The bubs themselves have the vax a little bit at a time as part of their 2, 4 and 6 month vac's so a 6 week old is still very vulnerable. I felt (and this is just my opinion) that it was important for me and anyone that would have constant close contact with DD in her first few months to be vaccinated to reduce her exposure risks. Not sure about the 3 month wait after having it for ttc, I was BF when I had mine! I think if you have hepatitis or measles mumps rubella vaccines you have to wait 3 months before ttc.

Hope your ttc journey is short and successful!