Clomid periods

C • TTC #1 since July 2013, BFP 14.11.15
Hi everyone. I am currently on cd 8 on my second cycle of clomid. On last cd 25 I started spotting. Barely anything. Not enough to warrant protection. I had that for 3 days then 2 days of medium flow, followed by 1 day of light spotting. AF is usually 5-7 days long with medium flow throughout. Has anyone ever experienced different/shorter/weird periods while taking clomid? I've read about thinning of lining so I'm a bit concerned!