Well let me start off with a little history. I have 2 healthy daughters about 2 1/2 years apart. 1st one was conceived in 3 months and not really trying, born 2008. 2nd one was planned and conceived about 2/3 months after removing nuvaring, born 2011. I have been on nuvaring again since giving birth in 2011. Removed nuvaring on 8/26/13 as we want to TTC #3, got menstrual cycle on 8/29/13 and it usually lasts about 5 days. Next cycles are 9/25/13 (normal) and 10/23/13 (normal). Started using the clearblue advanced OPK with this last cycle. Received High fertility on CD 16 and then Peak fertility on CD 17. We BD'd on CD 17/18. My husband works nights so we could not BD prior to that. Now my cycle came early on 11/16/13 instead of 11/20/13, so my LP was short. I had an almost none existant cramp on my left side Saturday morning, 11/16/13, and the bleeding followed. Does anyone know why this could happen? Would the CD 17 OPK have anything to do with it? If I got a Peak on CD 17 that means i would have ovulated in about another 24 hours or so. Is that too late? I'm so confused.