Hi,
not sure where i the world you are but for me the advice re: b/pumps was to wait until you are in hospital, and try theirs, as this is what you will get used to if you have to pump in hospital......then send out your partner to hire the same one. then if you are still needing it go adnbuy one before your hire costs exceed the cost of purchasing, (if you know what I mean).......
For example I was going to buy Avent electric pump, but was told that in my hospital they have Medela. I did have to pump in hospital and then ended up hiring for at home from the pharmacy. I didn't buy it as BF'ing did work out and I ended up bottle feeding fulltime from about 5 weeks
You might want to hire too initially. I don't think that at 28 weeks I would be buying a pump, it could end up being a waste of money...better to try beofre you buy i think