The timing of the acupuncture is quite important. You are right in that you will need 2 sessions, one directly before and one after. I had mine the morning of the transfer, I think it was about 2 hours prior and the second session was early the next morning. I think both sessions need to be within the 24hour period either side of the transfer. Not quite sure on that as it was a while ago. Do you have an acupuncturist who specialises in fertility? It might be worth having a chat to them and letting them know you are feeling a little apprehensive and discuss your concerns before you have the session, that way you will be more relaxed during the session.

I hope all goes well for you