Huckleberry Garden

My partner is the experienced dog owner, I'm new at this with a nine week old pup. I've just spent two days home alone with Humphrey (that's the pup), we went for a walk twice a day and he did any in between business in the garden.
Now I hear from my partner - who's home with him today - that he's already messed the house thrice today, even though my partner is probably far more even keel with him when it comes to discipline than I am.
The pup tends to go a bit bananas during the evening, especially when my man comes home, he messed the house then too.

I realise he's still little and there is probable not too rhyme or reason to him yet but this is noticeable. He has to be home alone for half a day tomorrow - I can't find a pupsitter - and I worry how he might behave, like when he's with me or like when he's with my partner.