the earliest (first response and clearblue) can be used from 4days before your period is due but they arent 100% reliable then as you may not have produced enough HCG and might get a false negative. I think even one of those two is only like 50% accurate on the 4th day before.
You can get more sensitive ones off the internet but they are often not very reliable and you can get false positives and false negatives - Drs dont usually recommend using them, so it depends on whether you want to risk a false result as to which ones you get
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