Two of our five Black Skirt Tetras are staying in one spot and guarding it. Eggs?

Mar 23, 2018
Two of our Black Skirt Tetras guard a specific area in our tank in one of our artificial plants. I think they might have eggs, but the spot where one of them keeps on going is obscured from vision. Here's the thing: this is only the third night of our tank being up. Can they mate and have eggs that fast, or am I just over-exaggerating? If you have an answer, please let me know!!!