No and it’s been alone for monthsAny other invertebrates in the tank?
Unfortunately the lobster just passed. I have no clue why but it just died all of a suddenDid you see your lobster carrying eggs? Females can store sperm (seen it happen in my own tanks) so it could get pregnant months after it’s last encounter with a male. It’s not unreasonable that only one survived, tankmates could easily clean up most of the larvae. Can you show pics of your adult’s underside, if it’s a male there is no way it could lay eggs and the baby is indeed just a hitchiker, if a female either is possible.