Try one attempt with CapsLock ON
Try one attempt with CapsLock OFF
Then switch the power off.
I've never tried Win10 and I cannot guarantee that power off will reset the count of password attempts. Just in case, DO take the number of failed attempts so far into account, pending news of the actual limit.
In second attempt, with Caps lock off, try to remember if you typed any capital letters and try to replicate that sequence.
Could you have brushed the shift key or rested your hand near it?