Post the transaction IDs here if you don't mind making them public.
You probably sent them with too low a fee. The Bitcoin network is busier than normal, there are over 55000 transactions waiting to be confirmed, and yours will be at the back of that queue if their fee is too low.
Your Bitcoins are not lost, either the network will forget your transactions after a long time, or they will confirm and your Bitcoins will show up in the mycelium wallet. If the network forgets your transactions your Bitcoins will reappear in your electrum.
This thread explains your options.
https://bitcointalk.org/index.php?topic=1802212.0