Rogue plants?

I have three plants growing at the moment, one almost ready to flower and a seperate two halfway through mothering. Other than a small case of spider mites, the only problem is that there are small sprouts popping up in the soil of both groups of plants.

I don't know what they are, I doubt they are pot plants, but as far as I know there has been no other plant seeds in or around the soil they've been grown in.

Any clues as to what these intruders could be?

if your not sure just wait untill the sprouted plants get big enough to tell weather its pot or not. Im not a expert at all lmao im totally new to this but thats what i would do.