I'd say leave it be until you get a bullet hole or crack.
I've had some horrible experiences with replacement windscreens in the past and a fairly pain free experience just last year.
The first was in a company Volvo S60, where I had to have 3 replacement screens following a crack or bullet (can't remember, 14 years ago) in the original before I was satisfied that there was no wind noise coming from it. At one point I had the regional manager from the windscreen company sitting next to me while we drove up and down an A road at a modest 50MPH while accompanied by a whistling banshee. "That's terrible" he said.
A couple of years later I took delivery of one of the last Rover 75s which had unacceptable wind noise from about 30MPH. Two replacement screens later and it was cured.
On the other hand, when Mrs 72 dudes' 4 month old Q3 windscreen developed a massive expanding crack last summer I was dreading having the thing replaced. But all was, and still is, fine.
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