Hi Norah,
We are in the process of being referred for iui at the moment. We had our FS appointment on tuesday where they also took our bloods to screen for HIV and hepatitis which you have to have before they will start IUI/IVF. They take 2-3 weeks and in the meatime we were given some information to decide on which fertility clinic we wanted to then be referred to for treatment.
For me, waiting times was a big factor so I just rang up the clinics! I dont know where in this country (or another country) you are but we are in cambridgeshire and were given the choice of Bourn hall, Leicester, Oxford (with choice of herts and essex centre), plus two in london. The details of some of those are in my recent post on my journal (see link below) but it really depended on the clinic. Some were 2 months to get initial appointment after receiving the referral letter and then 4 month wait to start treatment. However, others were 1 week for first appointment and then start on next cycle!
If you know which clinics you will have a choice of I would ring them up as at least you can then start mentally preparing for the timescales. Did you get given a contact number for a fertility nurse or anything who works with your fertility specialist? They may be able to tell you which clinics you will have a choice of and then you could ring up.
Goodness that turned out to be long! But I hope it helps as I felt in limbo when not having a clue of the timescales.
Love fluffy xx