People desperately want a 4th but nothing has been announced. Getting vaccinated means nothing either way as most places are advising that pregnant women get the vaccine when they can...Kate got her by age group.
A baby is just SM going nuts these days. People are so desperate they are analyzing everything she does or says and how she looks at every appearance in an attempt to decide what’s happening. Given how poorly she was previously any announcement will be very early on and will result in several weeks off for morning sickness at the end of which will be a second announcement with the due month.
Personally I think they’re done but who knows.