How likely would I be to knock her up in that scenario?

To provide you with a more accurate response, I'd need more context about the scenario you're referring to. However, if you're asking about the likelihood of conception during sexual intercourse, it typically depends on several factors, including: 1. **Timing of the menstrual cycle**: The ovulation period is when a woman is most fertile, usually around the middle of her cycle. 2. **Contraceptive methods**: If no contraception is used, the chances of conception increase significantly. 3. **Fertility health**: Both partners' reproductive health can impact conception likelihood. If you have a specific scenario in mind, feel free to share more details so I can provide a better-informed response.