Period help needed

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Since I stopped breast feeding my first son, almost a year ago, my husband and I have been ttc #2. The issue is I get light to moderate spotting right before my period really kicks in up to 5 days before! My ob isn't concerned about the spotting but I don't like it as I'm essentially bleeding for 10 days. Any one have this? How do I resolve it? Any tips on getting pregnant appreciated. My cycles are 24 days..when my real period kicks in.