I finish taking my femara (letrozole) med for fertilization, and i have 1 eggs 2.2cm size and my ob injected me for d egg to explode.how many chance do i have?

Can't guess : One can not say. Your doctor certainly has you in a very standard treatment protocol

Pretty good: If you ovulate, which looks like a good possibility, your chance of pregnancy is about 25%. That's the normal chance a fertile woman has of conceiving each month. If you don't get pregnant, don't despair. Keep trying the same regimen and hopefully you'll conceive. Good luck!