Appeared from nowhere

This flower has appeared in my border. Have about 5 blooms on long stalks. Looks as if it might be from a bulb but no idea what it is called or how it got there.
A day of catching up with housework and washing. The resulting ironing can wait. Washed some thicker clothes that will be rolled up and put away so will not have to iron them.
Lot of admin filing tidied away and then feet up this afternoon ready for yet another hospital visit tomorrow for more blood tests. Surprised I gave any blood left!
Watered the pots and although sun eventually came out still a bit nippy outside