The occupational therapist, from Kettering in Northamptonshire, said she decided to go public with her win to urge people to call their GP if they notice any changes to their skin or breast.
She said her first purchase was an iWatch but the couple have already looked at buying a house - with one they had been desperate to get appearing on the market on the day they won the jackpot.
"But I'm really passionate that if one woman, or man, goes and just checks their skin or their breast... if there's anything different, let the specialist tell you that - which is what they did to me." She said:"I finished my chemotherapy and then a few weeks later started the two weeks of radiotherapy and I was literally on the table having my radiotherapy and my bag was in the corner of the room.