Implantation? Or Clomid messing with AF?

Kate • Married 10-28-2017. Rainbow 🌈 baby boy born 11-08-2019. Golden baby boy born 08-03-2021. 1 angel baby (missed miscarriage 11-2018). 👼🏻

I had my first <a href="https://glowing.com/glow-fertility-program">IUI</a> on the 21st of July, my peak OPK was on the 20th. I took 50mg of Clomid cycle days 3-7. My cycle had been 21 days the past 2 months, but today is cycle day 25. I had really really light spotting today, light brown in color.

I took a test Monday 07-30, and it was negative. I’ve had what’s seemed like pregnancy symptoms, but for all I know it could due to AF.

I’m not sure if this is implantation or Clomid is making AF late and really light.

Any insight?

Thanks!