Period is 18 days late

I just went to the restroom and when I wiped there was a little pinkish tint. I don't know if it's from the red shorts I'm wearing, spotting or my period. I'm not trying to get pregnant but do you ladies ever have a scare and feel kind of sad at first when you realize you aren't pregnant? If you wait long enough you get used to the idea of a little peanut growing inside of you.