Eating habits and exercise affect TTC?

I am not overweight, I am perfect weight and on the thin side.. I am 22, but I'll be real honest haha, I don't really ever exercise besides walking the whole day at Disneyland like once a week with me stepkids (haha)... anyways, I also am pretty bad with junk food. 😩 I love junk food... my question here is, did anyone notice that after they changed their diets and started exercising it made conceiving easier? Or did it not have any affect on it? Of course I know it's better to eat healthy and exercise daily, but I want to hear some personal experiences!