Hi mkdig & Su
My dh and I had to buy our donor sperm from Luis Hughes in London - 10 batches for 10 cycles. We were told that a donor's sperm count, motility etc. has to be well above "average", like super sperm

because when its frozen then thawed, some sperm do die off so the count is lowered. We were told however that there were plenty in there to achieve a pregnancy!
After cycle no. 5 I raised the very question of our donor's quality etc. The sister asked the lab to test a tiny bit for us prior to insemination and the results showed that the quality, count etc. was exactly as it should be.
As far back to back cycles are concerned - I did 5 back to back - all natural - then had a month's break over last Xmas before no. 6 (as dh and I were emotionally drained with the whole rollercoaster). Then I got BFP on no.6!! So there is hope girls - be patient - it can take time - and it doesn't mean there is anything wrong with you just because it hasn't worked 2nd, 3rs, 4th time.
My clinic would open on a weekend when needed, there were never any problems with that altho I know other clinics will monitor you then give you hcg trigger shot to try and make sure it doesn't happen over a weekend. Def worth checking out. mkdig - are you in Britain??
Good luck to you both. Feel free to pm me if I can be of any help.
Lisa xx