Travel insurance (from Canada to USA)

Prior to finding out that we were expecting my fiancé’s family had booked a trip to the USA for us all. Our departure date is coming up quick and with the approval of my doctor I plan on going. I will be 32 weeks when we fly out and returning at 33. I’ve contacted multiple insurance companies with no luck on coverage past 31 weeks- wondering if any of you might have some tips or know of any companies that have better coverage! Thanks in advance!