Exactly! I have a very good germination rate, so I was positive the failure to germinate had nothing to do with me.
I always hold a couple seeds back in the refrigerator. I plant 3-5 seeds (depending on how many total of that cross I have) and see what happens. If none germinate, I plant the remaining seeds. It is my back-up plan. After the back-up seeds didn't germinate, I complained. Things do happen when germinating seeds. I had an incident where my cat knocked over some of the cups with soil and seeds all over the floor. But even most of those germinated after I scooped them back up into the cups and put them back on my window sill (though I didn't know for sure which seedlings were which because the labels were also mixed up!).