Just thought I'd contribute this info because the latest statistical evidence shows that having acupuncture on the day of embryo transfer increases the likelihood of conception by 65%, but it is desperately hard to find any acupuncturists who provide out of hours sessions at short notice to link in with embryo transfer...
In London, I have found two: the Helix Clinic, which has various branches, and the London Acupuncture Clinic on Harley Street. The latter requires you to have a consultation first, which must be within normal clinic times, so it is advisable to phone them the morning after egg collection, i.e. when you find your likely embryo transfer date is on the weekend
. I would imagine you'd need to get in touch with the Helix Clinic asap too.
Unfortunately, most other specialist fertility acupuncturists don't operate on Sundays, or even Saturdays. This is the case even if you've been their patient for months.