Be careful working with the ceiling and the existing texture. Both materials may have asbestos. Scraping or removing may release asbestos fibers.
Second this - do not disturb it until you get a sample of it tested.
Though, keep in mind, once it's tested, it's a disclosable item on the next sale and you will *have* to get it mitigated... nobody is going to buy the house unless you do (well, they may, but it's highly unlikely, due to the mitigation costs). I just closed on a rental house last week were this happened. We wrote into the contract that the popcorn ceilings had to be removed and the owner tested the popcorn ceilings, found they contain asbestos, and decided he didn't want to remove it.
We required it before we'd close and it wound up costing him $4500 for 400 sq ft of mitigation.
You *can* mitigate your own owner-occupied home in most states (though generally not an investment property). You have to follow all the environmental regs on how to go about , but it's not terribly hard, nor terribly expensive, nor terribly dangerous, if you follow the precautions.