plenty of people here have asked you to clarify this with your HR. and yet you still ask in /k

different companies have different policies and terms, get it? We won't be able to answer for you

mana ada unpaid sick leave under labor law. All falls to company's policy.

And it is likely only eligible when you have exhausted paid sick leave balance, then only can use USL.

Uncertified matter also not under labor law, in case you are asking

Again, all falls under company policy. Some companies allow without any notice, some will just straight mark you as unpaid.