Cyclical left-sided pain during luteal phase (normal endo TVUS)

I wanted to ask if anyone here has experienced anything similar, or if you’ve ever found answers for something like this.

For about two years now, I’ve been having cyclic pain on my left side that always starts a few days after ovulation and disappears a day or two before my period begins. The pattern is very consistent - always left sided, always during luteal phase.

The pain seems to start deep in my left hip area (around the iliac/ASIS region) and radiates through my groin, vulvar area, the inner and front of my thigh, and all the way down to my knee and foot. It’s a mix of sharp, aching, and cramping pain. The pain flares consistently thought out the day, usually lasting 2–7 days each cycle. It improves briefly with Advil/Tylenol, then returns

I had a specialized endometriosis transvaginal ultrasound at SUGO (Hamilton) and it came back clear:

“No evidence of deep or ovarian endometriosis or endometriosis-associated adhesions. No bowel or ovarian endometriosis were identified.”

(For context: they didn’t ask me to do a bowel clean-out I hadn’t had a BM for ~24 hours before the scan. The ultrasound took around 20-25 mins.)

But given how strongly it’s tied to post ovulation and the luteal phase, and how localized it is to one side, I can’t help wondering if it could be deep or nerve-related endometriosis, or maybe something else that’s hormonally triggered in the luteal phase.
It’s so specific and cyclical that I feel like there has to be an explanation.

Has anyone else had similar one-sided, post-ovulation pain — especially with normal imaging results (Endo TVUS).
If so, did you ever find out what it was, or are you still trying to figure it out too?

I’m just frustrated and overwhelmed as I have no idea what else to do.
I’d really appreciate hearing about anyone’s experiences or thoughts — even if you’re still in the “trying to make sense of it” stage like I am. 💛

Thank you 🫶🏽