Great going there Lizzie and Rakkers - here's hoping you both have sticky ones and a very uneventful 8.5months ahead of you! 
Milly - hello! Your name is v familiar, so welcome to the thread and you'll get plenty of friendly reassurance here, and probably the odd laugh as we go through!
Zeebee, yup, I think we're at a similar stage difference as last time! I started to bleed on Saturday so have reduced the buserelin and started on the oestrogen pills now. Finally. I was snorting the buserelin for 16 days, which felt like forever as I hated the side effects, with luck I won't get many or any with the pills now, although apparently these can make you feel really queasy so the nurse suggested I take them at bedtime.
Polly, hope the tx sticks - the good thaw and growth is surely a positive sign, so wishing you stickiness! I think my big worry for our next stage is the thaw, as we only have 1 frosty so there's a lot riding on him!
Hi Lotions, whilst I'm certainly no expert, I'd imagine the last ivf may have just confused your body (drugs, management of your cycle etc) - my first 'natural' cycle after ours was very long - up in the high 40s in terms of days, while I'm usually a 31-day-er. I wouldn't worry and would carry on SWI regardless - you never know when you might get lucky! 
Hope everyone else is well and feeling positive about the whole thing. I've rediscovered chocolate and sweets after a long stint of uber healthy eating so am feeling high on sugar (it certainly beats the druggy mood swings)!