Meanwhile the noise level in the next room has increased so I better intervene before murder happens.
Every parent that read this just laughed

You will be fine Lusche. I have twins (boy/girl) and I still remember the advise my wife gave me the first time she left me alone with them @ 4months old

If it's crying it's 1 of 6 things
Hungry.......feed it
Sick......take it's temp, if it's 98.6 it's fine, if it's higher call wife
Hurt.......if there's blood, stop it then call wife
Bored......play with it
Tired......put it to bed
If it's sloshing around, or smells really bad change it
They are 14 now and still alive and healthy (I know this because they have cold wet noses last time I checked) so I think these 6 bits of wisdom must have worked.
Enjoy this time, I'm fortunate enough to work from home and was able to be with them a lot, I wouldn't change any of it for the world