Petra got pregnant by self-inseminating with Rafael's sperm sample that she had illegally obtained and was withholding. This was done without Rafael's knowledge or consent.
Here's a breakdown of the circumstances:
- The Stolen Sample: Petra acquired Rafael's sperm without his permission.
- Luisa's Encouragement: Luisa convinced Petra she had a chance with Rafael, motivating her to act.
- Self-Insemination: Petra then used the stolen sperm to inseminate herself.
- Rafael's Reaction: Rafael was furious when he found out that Petra had his sperm illegally, got pregnant without consent and was withholding his sample.