Is my fiddle getting sunburnt?

I leave my fiddleleaf on my window ledge, but I've noticed recently it's been getting these lil spots on the underside of their leaves on the top? Are they getting too much harsh sun? 🙁 I'm waiting to repot them into a bigger pot near the end of the month since I've seen people recommend that they get used to their new home first before repotting into a bigger pot. I only water when the soil is dry about 2inches deep. I have been quite worried in case I overwater, and did think perhaps it could be edema? The pot has drainage, and the soil is nice and loose, not solid, and I make sure to give it a nice drink every time I water.