Spotting on Progesterone

Hi all!! Hoping for some insight -

I’ve had short LP and low P levels. This last cycle I was on Letrizol and Progesterone Suppositories. I’m 7 days past ovulation while on the P suppositories, and had some dark brown spotting this morning. Has anyone else experienced this? Just had my check in yesterday and uterine lining was said to look good, ovulated, and P levels were perfect. 🤔 wondering why I’m spotting.