I don't know if I should post this in mental issues, but I'm gonna do it here.
My question is, can a women get impregnated in a bathtub after someone masturbated there 30 minutes ago?
This will be kind of messed up, and it's mostly paranoia about something that has almost impossible chances of happening, but about 2 years ago I masturbated in the bathtub, without anything spilling in the water (mostly on me). I quickly cleaned everything up, and drained the bathtub. About 30 minutes later, I hear my mom taking a bath. Now the thing is, I don't know if I have anything to do with my brother's arrival a year later. He look similarly to me when I was a child, except he has blue eyes, while I have brown eyes. For genetic reasons, my mother has green eye and my father's mom has blue eyes, which means my father is a carrier of the eye color.
The thing is, I don't know if there are any reasons to be concerned or if this is a mental issue. On the internet, some people say that semen can't live in water, others say that it can. Also, for context reasons, I have always been very careful about stuff like masturbation, and never let anything spill anywhere. What are the chances of this actually being true? If not, how can I get rid of this mental issue?