I took 4 pills at one time (as diagnosed) to cure chlamydia, on Monday night. I am currently on the depo probers shot and have been for five years. No problems with it whatsoever. I started spotting the day before I got on the antibiotic, but the doctor said it was just from the chlamydia. It got heavier after taking the medicine. And now is slowly starting to go away. But it's Thursday. Should I be concerned that I'm still bleeding? I know that antibiotics can cause you to start your period. But shouldn't it be gone by now?