Disclaimer: logically souls or rebirth or afterlife don't make any sense and there is no reliable evidence to suggest they are real. We know we are our brains and every feeling you have is caused by electrochemical signals in your brain, that much science has proven. How would souls interact with brain? If the soul added some extra to the system in the brain that would probably break the laws of physics, and no such interaction has been detected.
But still, afterlife worries me. Most religions say suicide is a bad thing, and it usually causes a lot of pain in your loved ones, so if there's karma or judgment or whatever on the other side then the next life mkight be even worse than this one
After 49 days of conception the mind fires its first burst of electrical signals and the heart starts to beat, some believe this electrical burst that starts the mind is the soul entering the body, or the mind, if you want to link consciousness to the soul you can, some believe its the same thing,
Some also believe the soul is in the DNA, either way, there is something that happens on the 49th day of conception, yes science says its electrical, but there are parts of life science will never be able to explain as them things are non physical, and do not abide by our laws, ( that's why physics and quantum mechanics as of yet, can not be combine into a grand theroy ), check the double slit experiment for a perfect example of how some things can act, In a way that seems to us humans at this present time, impossible,
That being said, the universe can not delete energy, it can only transform it, this is fact, there has to be a set amount of energy contained inside our universe in order to keep it how it is, even if a small fraction of energy were to be roved form the universe a series of collapse will accrue and it will no longer exsist, so knowing that, you would think the energy, that first kick started the body on the 49th day could be the soul, and energy can not be removed, only transformed, when you die, that energy has to go some where. Right?