Had unprotected sex on the 4th. The <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> shows that my fertile window began then. My last period was June 22 and I average a 30 day cycle give or take. Understand that apps are not 100% effective in predicting ovulation. Because I was in my fertile window I took plan B the 6th. I noted egg white cervical mucus throughout the 9th of the following week. It has since dried up and become sticky. Today when I went to the bathroom I had clotty, brown discharge. My breasts have been sore, I have been cramping today and had acne on my chin. All normal pms symptoms from me. Could this be a side effect from plan b or implantation bleeding?