Assuming you’re living close to your partner, the actual amount of effort necessary would be a lot. The very narrow time window described is actually multiple weeks long. This is because when you go off hormonal birth control the first thing that happens is you have a period, then you need to stop taking it long enough for your body to rebuild the lining enough to be receptive.
You really have to not be paying attention to your partner, or your partner and your lifestyle is that neither of you live closely, for this to just happen.
Additionally, I feel this amount of mistrust should say a lot more about the relationship than about the woman. If you don’t trust your partner not to go off her birth control for multiple weeks to get secretly pregnant with someone else, why are you their partner? frankly your partner deserves better than you.
You really have to not be paying attention to your partner, or your partner and your lifestyle is that neither of you live closely, for this to just happen.
Additionally, I feel this amount of mistrust should say a lot more about the relationship than about the woman. If you don’t trust your partner not to go off her birth control for multiple weeks to get secretly pregnant with someone else, why are you their partner? frankly your partner deserves better than you.