I doubt anything would come of it, a health agency would have to pursue a case and find probable cause that you did something... They aren't going to do that. Fraud is a strong word, I'd probably stay away from saying that.
My best advice to you is to just focus on gaining health insurance in the province you intend on settling in. If you land in Alberta first, and if Alberta has a policy of providing a health card on day 1, then take it. That's where you legally and rightfully landed. However, if you don't intend on living in Alberta, just fly/travel to an Ontario port of entry if you aren't part of a restrictive program like a provincial nominee program that states otherwise. Whatever you do, just follow the rules of the program you're a part of.
If you so happen to be in Ontario when you give birth with an Alberta health card, so be it. The policy should cover it. And if you intend on staying in Ontario, I'd skip trying to 'short land' somewhere else and just stay in Ontario long enough to get things established. For example, even if you 'short land' and return to your home country, establish a Canadian bank account, have an address in Ontario (rent a mailbox, use a friend or family member address, anything to establish residency), get a Canadian cell phone and direct the bill there. Then when you return in 3 months you'll have coverage since 3 months will have passed since you established your Canadian residency.
Just keep in mind, once you are a Canadian PR, you have rights of residency anywhere. If you settle in BC or Alberta or Manitoba and can't find work/get settled, then you move to Toronto for its larger job market and better opportunity, there's nothing fraudulent about it. You have the right to move anywhere in the country. There is no 'fraud' in this, it is your right.
I would say just make sure your intent is correct. If you land in Alberta, go back there and see if you can give it a shot. Have your baby in Alberta. If after a few months you can't find work or don't like it, then move to Toronto at a later date. I don't think landing in a province just to get a health card is worth the hassle quite frankly, at that point I'd say maybe buy a private health plan and see if it'd cover your visit should you give birth within those 3 months.
Whatever you do, best of luck!