Hi Kasham,
I have this sinus problem too since young. I can sneeze non stop the whole day unless I go and sleep for at least 3h.
My gynae did say this sneezing is a problem cos the force is quite large. He said to hold the womb if u feel that a sneeze is coming.
Eventually when I got preg, I really tried my best not to sneeze during the 9 months. If I feel that my sinus is acting up, I will quickly take med and sleep it off. Or at least try to lie down to stop the frequency of sneezing. Just do whatever it takes not to sneeze.