Made one mistake

I'm not great at dating but have had some success mainly with drunk women. I (31) came home from interstate (2022) to start a new job and was staying with my divorced sister (29). Neither of us had children and our parents were deceased (Covid 2020), didn't take care and believed the bullshit. My sister had recently divorced her husband, mainly for not wanting children. We both have good careers and settled in to living together, no hurry to find my own place. My sister was dating regularly, and I also did date at times with no success. Anyway, I came home from another failed date and my sister was home drinking and was drunk and was in just her underwear. As I said most of my sexual success was with drunk women and as my sister dated and I assumed she took precautions. I decided to try my luck you could say, I succeeded and got to fuck her twice. My assumption she was protected was totally wrong, she wasn't. But what the chance she'll get pregnant to me, well in my case 100%. After every test possible and no problems found, she decided to have the baby. Also suggested we get jobs interstate to raise our children (girl), jobs were easily arranged, and we started living together as man and wife. She changed her surname back to her maiden name and wears our late mother's rings as she gave back hers to her ex-husband. We sleep together and are quite happy with our relationship and plan on having more children as well.