Need to give myself a extra push to perform blow jobs. .

Blow job tips please. I've completely gone off sycking my partners cocktail and it's starting to be a issue for are relationship and I don't want to loose my man I love him so much but since I became pregnant every time he asks me I always have a excuse but not a good one but he accepts it but I know deep down he's getting fed up of asking. I need to think of ways to make it appealing again but don't know what. Any advice would be helpful.