To have cancelled the appointment - I am not BU am I?

[snoopypoodle]

Had a dentist appt booked for this afternoon. DP was going to finish work earlier and go with me and look after DS (2).
Spoken to DP and a few things have been delayed at his work today so he cannot make it. I have no alternative childcare arrangements or anyone that could have him.
DP said I should just take him and give him my phone or tablet to play with but I don't want to do that, he's only 2 , I'm having treatment which will last 30-40mins and there's a chance he could get bored and start wondering around the room etc which would probably be getting in the way of my dentist not to mention any potential h&s risks.
I have told DP I won't do that as it just won't work - he said its up to me and they're my teeth/my health and he would just take him in my place and that the dentist won't be able to get me in for ages (she is in v high demand). He sounded like I was being U for cancelling as DS would be 'fine'.

I've cancelled and rearranged the appt for next available date which is mid Sept. I'm not in any pain so this shouldn't be a problem.

AIBU for not wanting to take DS on my own?

I wouldn't have taken him either. I imagine dentists rooms are not safe places for 2 year olds to wander around. And you can hardly supervise him lying on your back with your mouth open.

I would have cancelled too - if you saw him doing something dangerous out of the corner of your eye, I'd think theres a risk youd have leapt up out of instinct without stopping to consider there was a drill in your mouth! Its dangerous for everyone in the room really.