I agree with PugBug & gapeach.

The hardest part is waiting and not knowing... we completely understand.
Ok, these questions are not meant to be harsh... just to give the rest of us a general overview of what's been going on. I sure hope the rest of your hatch goes well!
Yes, there is still hope!
First, what kind of incubator are you using?
How many times have you opened the incubator since lockdown?
What were your temperature/humidity readings before you opened the incubator?
What were the reading immediately after closing?
What are the readings now?
How many eggs do you have incubating? (was it just 3 that you mentioned, or are there more?).
Have any of the other eggs pipped? (Do you hear any internal chirping? Are there any cracks on any of the other eggs?)
Next, you need to sit on your hands... do not touch the incubator. Try to relax. Read a book, go to the grocery store for some wine... or go soak in a nice hot bath. Whatever it takes.
My opinion is that you will need to give it time. Waiting for the hatch is the hardest part! Trust me I know... it's super stressful, and I'm pretty sure it causes ulcers. LOL.
We're pulling for you!