to have no idea where to start re nursing bras?!

[Cranberri]

Packing my hospital bag and buying last bits and pieces. How on earth do I know what size nursing bra to buy? My boobs have gone from a 34C to a 34C/D, no idea how much bigger they will get. I don't have the money to be buying multiple sizes and returning things etc and nowhere seems to sell them in store cheaply (I'm looking at eBay).

Anyone any advice? I've not got a clue!

I also went up from 34B to 34F. I was struggling with SPD so made my final trip to M&S at 35 weeks. I ignored the assistant telling me it was too early (no way could I physically make it into the shop again) and ignored her advice about back sizes as my back size wasn't changing, just the breasts. I ended up having to get more online because I went up yet another cup size in the next few weeks. I was temporarily another cup (G) bigger for a few days when my milk came in.

Second time round when my breasts repeated their B to F magic act, I had the original stock still. I got a few stretchy crop tops which were great in pregnancy and comfortable for support when sleeping.