I Don't Know How To Correctly Format This Question But

I don't know how to correctly format this question but here it is , I recently had my birth control removed January 12,2017 and had unprotected sex until January 20th because I started bleeding I bled until January 24th and same day unprotected sex with an ex , I took a plan b pill January 25th and continued unprotected sex January 28th on February 1st I had unprotected sex but it followed with light pink bleeding and now it's like I'm having another period , could I be pregnant or is it just another period ?