I went from a 36 DD to a 36 I and I used icy hot patches on my back and as your belly gets larger your back may hurt laying down then you could also try laying on your side with a pillow between your thighs. I have back problems and this has helped me a lot!
Definitely can relate I was a 36dd and will be 34 weeks on sunday and I also have only been wearing sports bras only things that are comfortable and my sports bras are xxl. I've always had back pains because I'm only 5 ft tall and pre pregnancy weight was 97 so I'm very uncomfortable.
I was 36DD before I was pregnant.....I'm 15 weeks I definatly feel your pain. I only wear sports bras lately because that's all that's comfortable. I haven't gotten remeasured so idk what size I am now since my sports bras are labled XL
I went from a 32 a to a 32d in just a few weeks. Its normal.
& I didn't start showing till about 25 weeks only thing that grew were my boobs
Its normal. I was the same with my first my breasts went up from a D to a DD and stayed that way now I started this one as a DD and now my boobs are getting a bit bigger. And its completely normal for your back to start hurting way before you start showing.
I live in Australia so the bra sizes are different here but I've gone from a 12DD to a 12E or 12F my boobs hurt as well as my back I don't think there's any thing you can do about it I get my partner to massage my back & put lotion on my boobs and massage them it helps with the soreness :)