Is there such a thing as over-doing it during TTC??

I know this might be a stupid question but...when you're TTC, should you be careful what you do physically? I mean not do anything drastically crazy, but like watch playing sports with family and things like that? I don't want to over stress about things cause I know stress plays a big role so currently right now I'm just going about my daily business and playing with my little sisters (which involves running around and wrestling some lol) but can that affect it?