Hi. I've been on Ortho Cyclen Oral contraceptive for 3 years, never missed a pill. On one of the last days of my last menstrual cycle, I was giving a one-time dose of Azthromycin. Nine days later, my boyfriend & I had sex but we used a condom and I took Plan B 6 hours later. My gyno said since I was past 7 days of no antibiotic I would be fine but I felt the need to make sure with Plan B. I'm currently 2 days away from the date of my next period and have tender breasts. I've read that this could be a sign of pregnancy or that my body is freaking out at the massive amount of hormones in my body. Can anyone give me any feed back? I'm really freaking out.