So according to my tracking app, I was ovulating between the 17th-22nd. My fiance and I had sex on the 14th & 15th and also on the 21st and the 22nd. We aren't trying to get pregnant, but we aren't not tying either. Since we are moving to a different state, and starting new jobs right now though, I did take a plan B on the 15th. Today, the 23rd, I'm experiencing dark spotting directly after my ovulation. My cycle is pretty regular, and I've never experienced this before. Is this cause for alarm? Is this probably due to the plan B? I'm not sure what's going on. Anyone have any idea?