I took the Next Choice pill about an hour after having sex and having the condom break. I only took one... I was scared I was going to have heart attack if I took the other pill. I have anxiety. Anyway, a few days later I started having brown "blood" come out.. And it's a lot. It's been going on for about 3 days now but today is the worst. I feel worn out and nauseous also have a headache that hasn't gone away and my neck is sore. What could this be..? Should I go to my doctor..?