Pre-approval and Credit

[Conor Lehane]

I'm currently educating myself on the aspects of RE I want to pursue but I just want to throw this question out to Moore seasoned investors.
Does pursuing pre approval for mortgages put a hit on your credit?

I have good credit simply because I have only lived in the US for five years . My wife is adamant about never falling behind on payments. That brings up another question. Does the fact that I am only building credit a short time affect getting pre approved.

And last but not least my wife thinks that if I do have a mortgage on an investment property it will affect our chances of getting a mortgage in a few years when we upgrade our own place. This seems excessive but thoughts are welcome

Thanks in advance.