Pssst - Damn good work fitting yourself. Bet you feel fab! M&S bras are fine and normally sized, you just need to keep away from their fitters and sizing chart. They are still applying the old +4 rule on the band.
Lazy c&P from down thread: Well, y' see there is logic in the misinformation. It did used to be necessary to add 4 inches to the band measurement, a 34 band used to measure 30. But, the industry standard was changed years ago to 'simplify' fitting. It would have done if it'd been publicised in any way.
It really was yonks ago that it was changed, but the news just doesn't seem to have spread most many fitters still use the old method as do a lot of calculators and instructions of all sorts.
It's damn stupid.
if you follow the chart and then take 4 from the advised band measurement you get the actual size required. Maybe one of the chief execs has a fetish for badly supported breasts 
Time - I make that a 32F, which would indeed be a 32EE in some brands. Most don't do an EE and just go straight to F, it's the same size whatever it's called. You could also be a 32G.
JenniL - try 32D and if the band is too tight 34DD, your ribcage will expand significantly very soon. (you were 32 weeks, right?)
Clarence - your official starting size would be a 30DD, if you can't tolerate a 30 band then try a 32D. TBH I think the gaping is to do with the model of bra, not all models suit all breasts and maybe the sort you like to wear just isn't for you. Are they plunge bras? THose are notoriously difficult to fit, try many sorts or maybe just go with balconette or full cup. Gel / padding doesn't effect the size you need to buy.
fayeso - the band should be tight, that's what provides the support and it's well worth getting used to. I make your starting size 32F but it's entirely possible that a 32G would fit better.