I believe the percentages are taken from surveys, not actual research in effectiveness.
Meaning that according to their poll results, 1 out of 100 women become pregnant when using the pill.
For condoms it’s 1 in 8 odds.
I had a GF who could not be on the pill because of side effects. We had sex rather regularly using condoms. After 3 years I should have had at least 20 children according to the odds. I didn’t because I played it smart and didn’t take any risks. If your girlfriend does the same with the pill things should be fine.
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