DS (4.5) was late to potty train but has reliability dry since about Christmas.
But... since starting school last week he’s had a complete regression 
. He’s only been doing mornings so hasn’t wet himself at school yet, but has been wetting himself more or less constantly at home; he did every wee in his pants over the weekend, apart from the ones where I realised he was due to go and took him off to the toilet myself. He’s also been quite under the weather with a cold, so I imagine that’s not helping.
I’m really worried about what will happen when he starts full days.
Can anyone help?? Do I just need to ride it out?
He’s suspected ASD, if that makes a difference.