im in the same boat mate, my mrs is super fertile.
ive only got to go within 100ft and she is up the duff,
1st time she was on the pill, 2nd time she had had the injection. when we went to the docs they were gobsmacked.

apprently there is a very very small percentage of women that the injection and pill doesnt work on, however with most it will only be one or the other that doesnt work.

it had to be my mrs that was the one that neither works wouldnt it? lol

im now looking into the snip