Just keep drinking fluids, try lemon, ginger and cinnamon tea, with a dollop of honey, helps your throat and cough (f you have one), I've been drinking it as everyone has had a cold (fingers crossed, I have t had it yet, the only one left)
They recommend that you have the whooping cough vaccine about 3-4 weeks in advance as it takes a while to be effective.
You would surprised what your body can handle even if you arent feeling well yourself. If you are worried then try not to kiss bub on the lips. Hope you feel better by the time bub arrives