Random Spotting

I have only ever spotted once before and that was when I was younger (a couple years ago). I went to the bathroom and found a light pink discharge when I wiped. I freaked out because the last time I had sex with my boyfriend was during my fertile window and just so happened to be seven days ago. I've been feeling a tight "cramping" feeling where I would normally cramp. But I dont start until next week and I've been regular for a while now. Am I imagining things? Is my body just changing? Or what? I just want answers to calm my anxiousness.