Not hypnosis, but starting with my 3rd cycle, I've used a guided meditation series created for IVF. It has four sessions - one for stims, one for retrieval - transfer and two for after the transfer. They're 15-20 mins each. I got them at anji.com You can download some of their free stuff first to see if it's something you might be interested in trying.
I don't know if my situation would count at all but thought it worth mentioning. My 3rd cycle was last Dec and at our company year end party they had a hypnotist and I volunteered with some of my co-workers. At the end he said "you can do anything that you put your mind to. Think of that now and it will happen". Of course, my ER was in a few days so I thought of IVF. I ended with the first BFP I'd ever had in my life. Unfortunately, I did m/c the next month... but who knows?
I get my beta tomorrow. I POAS this AM and still neg so I don't hold out much hope for this time. Who knows... maybe that deal from that hypnotist was what worked!