Idobelieveinfairies - I really htought that, if anyhting, the 36 was too small, but could not see how it could be - I've put on weight since having the dds, but not that much...
Was a 32D pre-children, and no problems etc. Got pregnant, put on some weight, ribcabe expanded etc, and was measured for maternity/nursing bras as a 34D/E with dd1.
Time passed, got pregnant with dd2, and was measured as a 36DD. Didn't think it was impossible, and as I've always worn underwired bras, thought that any discomfort was due to general pregnancy/feeding changes or due to wearing soft bras which 've never got on with.
Finished feeding dd2 a few weeks ago, and started wearing my underwire bras again, and was soooo uncomfortable. The wires were digging in, and the whole bra seemed far too small. I couldn't really see how I was any bigger than a 36,as have recently lost a bit of weight, so marched off to bravissimo to sort it out once and for all.
Turns out I am still a 32, but gone up a single cup size only in 5 years and 2 children. No wonder i was uncomfortable.
It is really worth going in to the shop - had a lovely girl fit me, and I was a bit tricky, so took a little while, but we got there, and the difference is amazing.
If the wires are going too far around your back then I would definitely say that the back size is too big - I would make a date for October if I were you!