Don't know. Never tried in mycelium. I think not. Only when the wallet drops waiting for tx to confirm and shows your balance back.

Few more links to rebroadcast (push) raw transaction:
http://eligius.st/~wizkid057/newstats/pushtxn.php (Eligius mining pool)
https://blockchain.info/pushtx
https://www.f2pool.com/pushtx