Waiting Period To Use New Health Insurance?

I realize the first doctor visit and maybe whatever tests he might run are going to be paid by me up to the max of the deductible. But what about a waiting period. If you need to see a doctor and the doctor runs tests say two weeks after you get the insurance, are those expenses going to be questioned or subject to rejection, or will the insurer just run them against the deductible, co-pay and full pay as stated in the policy? Any help appreciated.
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