AF a week early after 1st IUI...

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Ladies, anyone had their cycle change after IUI? Had my first IUI the 15,16,17 and 18th May. I have a 30/31 day cycle. I spot 3 days or so before AF. Started spotting 6dpo, then 7 and 8dpo- very light spotting. I’m 9dpo today, 5 days away from AF, had more of a first day of AF today, didn’t seem like spotting to me- it’s reduced through the day.

Just wondering if anyone else has experienced something similar?