I married my sister

I'm 5years older than my sister, but she is my stepsister actually and we've never used step when describing our relationship, just said sister or brother. My father died when I was almost 3 training accident, he was in the marines. My mother remarried 18months later and then had my sister, I don't remember my father but have his photos. Fast forward to when I was 17 almost 18 and an uncle (my father mother's older brother) on my late father side passed away, having outlived his own children and siblings. He had done very, very well career wise and financially owning property, stocks, bond and had a lot of money in the bank. Covid took him as it did my stepfather and mother mere months apart. It took some time for his lawyers to track me down (May 2021). Luckily, I turn 18 before my mother died (August) and had a fairly good paying job. As my sister was allowed to stay with me albeit with some supervision. As of May 2021, my financial situation changed much for the better and I left my job and with my sister moved to live in our new house as I called it. No more renting for us, my late uncle's lawyers were a great help with getting it all approved for us to move interstate together. Shortly after our move I turned 19 (July 2021). Always close growing up my sister and I were not much at mixing with people and kept to ourselves mostly before and after our mother's death. She started in her new school, and I started to get to grips with my inheritance. The lawyers hired a personal assistant (babysitter) for us to watch over my sister, part of the agreement they had made to allow us to move. It was just till my sister turned 18 and wasn't hard for us to accept, the PA took care of anything required by the school and medical issues if they came up as well (none did). Last year my sister turned 18 in February and the requirement for the PA disappeared and she decided she didn't want to go to university. She had well at school and could've even got a scholarship if she wanted, but I would've paid for her if she so wanted. I was across my inheritance and not involved as my uncle had been, we travel together and in March this year became lovers while overseas. It just sort of happened, we were sitting together then cuddling and onto kissing then fucking. No precautions taken at all; I was her first lover. I've had sex before, but with no one special enough to marry. We worried about her getting pregnant, and so we married just in case she got pregnant. She didn't, overseas we used our passports to get allow us to get married as I've always kept my late father's surname and she her father's surname. Returning home telling nobody we'd married and after the months since we returned, we still haven't told anyone. We're happy with our choice to marry and my wife is now pregnant