it is a "banana" or male flower. I would pluck it out with a tweezer. eventually it will open up and release pollen which is ok if you are looking to make some seeds but wouldn't recommend it on your 1st go round.
Thats what they look like bananas. If i leave them would it affect plant besides having seeds? This is only plant im growing so im not really worried about some seeds, def dont want a garden full either