Spotting

So I had sex on October 10th and started my period 9 days early after I was off my period I had sex on October 20th about 24 hours after I got very light pink spotting and got a little more red 48 hour and 72 hours it was so light you could hardly tell there was pink. I have had mild cramps. The reason why I’m here is because my period is never 9 days early and I have never spotted after sex. No the sex on the 20th wasn’t any rougher then I have had before. I am wondering if any of you have experience this and if it’s normal or something I should be more worried about. No protection was used and I’m not on BC. Did finish inside on the 20th.

Thank you for your help!☺️