How can you be sure that your SCD yogurt came out right?

Anyone have experience on this? I just made it for the first time. It tastes like I heard it should. It's kinda tangy. It has some lumps in it and isn't as smooth as store-bought plain yogurt though.

The thing I'm worried about is that the yogurt maker I used is known for getting too hot. At the 6 hour mark I opened the top and put a thermometer in (I found out later that I'm also not supposed to do that) and sure enough it was too hot, somewhere around 112-115 degrees. I read that this won't kill the bacteria, but it will slow them down a lot. So I took the lid off (of the yogurt maker but not the lid of the actual container the yogurt was in) and crossed my fingers. The next day I gave it an extra 4 hours to incubate, so it incubated 28 hours in total, hopefully making up for any time lost to the heat. At the end I opened the top and put a thermometer in again (while it was still in the yogurt maker and receiving heat) and it was at an acceptable temperature at that point.

So can I tell by taste or texture or anything if it came out right? I tried a spoonful this morning like seven hours ago and I'm not dead yet. The smell and taste are about what I would expect. It is distinctly sour but not in a distressing or overwhelming way. I have read that if the yogurt doesn't get enough incubation there will be sugars and whatnot left that are not acceptable for SCD.

If it looks OK and (especially) it smells OK then you're fine.
Remember yogurt has been made for many thousands of years without fancy things like thermometers or even kitchens. It's milk that has fermented, that's all.

The part where you heat it up to kill any pathogens is a recent development (and a good one). If you get that right and cool it down enough not to kill the new good bacteria you're adding it should come out fine.
If it's too runny then there weren't enough good bacteria added or the packet was old, etc.

SCD likes to do an extra long fermentation/grow period to eliminate as much lactose as possible.
Hope it works for you.