Upcoming FET, struggling with picking an embryo

Context: I am undergoing a natural cycle FET on Tuesday. The cycle has been really chaotic and honestly I am apathetic and doubtful it will work, which is depressing but maybe part of the whole IVF process. My dilemma: I have three embryos remaining, two are graded the same (boy and girl) and one that is a day six 5BA male. The clinic has left it up to me to decide which embryo to use since they are the same quality and grade. I don’t know what to do. First of all I know that there’s a 40-50% chance it won’t even work, rendering this whole stream of thought completely useless. But say it does work: Personally, I think I would prefer a son, but I also have a sister and I can’t imagine my life without a sister. I know this is basically the least of my worries but I needed to say this in a nonjudgmental space with people who understand. I’m inclined at this point to just tell them to decide for me so the weight isn’t on me. Idk. I feel defeated already because if either gender is selected and doesn’t work, I will have a lot of grief about that.