*Possibly some TMI*

I’m 12 dpo today. We’ve done Clomid the previous 3 cycles, <a href="https://glowing.com/glow-fertility-program">IUI</a> the cycle before with Clomid, and this current cycle has been natural as I had a cyst on my right ovary. They did check my progesterone 7 dpo for me (I had issues with positive OPK but not REALLY ovulating) and it showed I had ovulated at 15.17. The last few days I have had my normal AF signs of achy legs, sore nipples, and fatigue. Not holding my breath on it being my month since no medication. This morning I was kind of crampy and noticed a large increase in watery CM- less than an hour later I wiped and noticed brown discharge? My AF is not due for another 3 or so days as I have a semi longer LP. It’s definitely never started before 14 dpo. I have had no more brown discharge but still feel kinda achy/crampy (although I feel like I’m thinking into things too much probably). Do you think this could be implantation bleeding at 12 dpo? Is it possible even with AF symptoms before?