The corpus luteum signifies the number of follicles that developed and burst this cycle. Not all follicles release eggs and not all eggs fertilise. There is a slight possibility but it would be likely they'd see more than one "smudge" if that were the case....


Eta: when they give you the trigger you can have more than one follicle (I usually had upwards of 20 immature follicles) - but they use the size of the dominant one/s to decide on trigger time. You likely had one that was large enough to release a mature egg, and a few that were too small (but because they still ruptured and released the immature egg at trigger, a corpus luteum was formed at each location)