hi linda,
this question should be your personal preference and depends on the condition of the plant and the substrate. Sometimes you are lucky and the substrate will be fine for a few months, other times there might be an infection already present when you buy the plant that spreads undetected in the pot.
There are things you can do to help you judge - smelling the pot is a good thing to do, get your nose real close to the bark and smell it - it should have a wet bark smell, no weird smells - it's hard to describe but that is a good place to start, make sure it doesn't smell bad.
Next if you can with a tooth pick try to dislodge any loose bark on the surface of the pot to get a closer look at the roots on the surface, see if you can spot what is in the center of the pot, a lot of times there will be a really firm spagnum moss ball in the middle of the pot which causes most problems on a newly bought orchid.
If it has a moss ball I would transplant it but if you spray the outside and try to keep the moss dry and check by smelling it then you could risk leaving it till the plant has finished blooming.
the risk of transplanting is damaging the roots and causing the flowers to drop early.
the risk of not repotting is that the media could be going bad which will lead to the plant losing some roots.
Hope that helps you decide.
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