For the last eight months, my monthly cycle has been regular. I could tell you the very day and sometimes the hour I would start. My husband and I have been trying for a baby. I've been on Clomid on and off during the last year. My cycle was 30 days long. I would start on the 24th of each month. Last month, I had my tubes tested for blockage. My last cycle began two days early, April 22nd. I am on day 17 of this cycle. I've just experienced some slight spotting. Can you tell me what would cause this? I'm really worried.