First plant growing , a second stem from soil appears ?

Hi guys, I didn't know exactly where to post this thread bc I never heard or seen this happen or couldn't seem to find the solution online, so I figured why not post it here. My plant is currently on week 4 and is looking great so far, and I just realized today why water my plants that another stem started growing from the soil . I have no idea if that's another plant just growing out of nowhere or what not, but my question is do i leave it there? Or do i take it out and put it in another pot for it to grow ? I had only planted one seed and started it off in a red cup and transplanted it to a bigger pot about 1 week ago .

Transplant.

Wow

Didnt think that was possible...be careful transplanting especially if its some sort of veg growth from your big plants as you may end up damaging roots.

Or you may have brought some feminised soil lol!

Jokes aside never seen anything like that before

Transplant it and enjoy a second plant.