What Causes Menstrual Bleeding Post Vaginal Hormonal Ring Removal?

I was on the nuvaring for 6 days then got off of it because I was cramping and I had unprotected sex with my husband within 7-10 hours after taking it out but 3 days after that I started light bleeding , this is the second day it s a little heavier however still stringy and light. Compared to my normal periods What could thins mean?