Endometrial thickness

I had a fertility scan today (day 23 of cycle) and they measured my endometrial thickness as 5.7mm. The sonographer said it was within average and the range of average is quite large for endometrial thickness, but that it was fine for the stage I am in my cycle. I’ve obviously come home and googled 🤦‍♀️ and looking at the figures I’m worried this is thin for this late stage of my cycle?! Has anyone got any experience with this? Are there any supplements/treatments to naturally boost the thickness a bit? Thanks