To be perfectly honest, I suspect your 11b application will fail due to not enough time having passed yet. After the SCC decision in Jordan, most POA courts ARE adapting the 18 month ceiling as applying to them. The good thing with the Jordan interpretation is that it eliminates the need to have to establish 'prejudice'---since it will be presumed after the ceiling.
Their acceptance of the decision has a lot to do with the rationale that POA courts can't have it both ways----they are either competent courts able to award constitutional remedies (e.g. stays under s. 24 of the Charter) or they are not empowered to do so. If they are able to provide such remedies (which is widely-accepted now!) then they are quasi-criminal in nature; making the Jordon decision applicable to them.
You can read a very good analysis in the R.v.Ramsay decision (decided by a JP at the OCJ).
You'll also notice that the JP accepts the SCC's analysis that the Morin decision is outdated and the time limits must be more flexible.
Of course, keep in mind that this is just a JP decision. The matter has not been fully decided by higher courts----but they undoubtedly will also agree with this basis. The SCC made a very detailed statements that would be very hard to go against.
So, bottom line: I think it will be difficult for you to win on an 11b argument at this time.
That's not to say, don't try---go for it. Raising your wife's pregnancy issues certainly will create sympathy by the court. Just be prepared to argue your case anyway (which by the way, will be very difficult to do without disclosure!).
Just be aware that if you don't get the disclosure before your trial date, I highly doubt the court will give you an adjournment if you also argue an 11b application (after all, you'd be saying you are ready to proceed to trial when making the 11b application!).