That’s not weird at all! If your current bra cups do fit properly, and you are in fact a 32 band, then it would technically “translate” into a 32DD; however, the only way to know for sure is to go try some stuff on! I believe a 32DD shouldn’t be too difficult to find, but you might have trouble with the 32DDD. VS does have it, but I find their 32 to be larger than the other 32’s I’ve tried. I’m not sure what is available to you in your location, but if you see any speciality lingerie shops around, or department store lingerie departments, give them a go! Also, if you do go to VS and they try to measure you, TAKE IT WITH A GRAIN OF SALT. Recently, I was again measured by a La Senza employee (La Senza and VS are owned by the same company), and was told I was a 36C, despite the band of the 34DD I was trying on at the time (La Senza doesn’t carry 32DDD, but this bra was very pretty and on sale so why not) being clearly way too big for me.
I have a bit more of an in-depth explanation of bra fitting on the FAQ’s, so do feel free to check that out as well. Good luck :)