TTC, I did two rounds of iui this summer/autumn.
On both I had Gonal F injections every other day for 12 days, starting on day 2 of my period (ie CD2). Lots of scans throughout to check follicles growing. On CD14 I had a trigger injection to make me ovulate, and then IUI was on CD15. Two weeks of progesterone pessaries and then test day.
Unfortunately neither took, so we moved on to IVF. We had bought a 3 round deal, but ended up abandoning the third round. The deciding factor for us was the cost of donor sperm - and how quickly it was getting used up. We bought 5 vials for about £5k from Xytex. Using a whole vial on a sub-20% chance felt silly when one vial could fertilise multiple eggs (and fresh & frozen rounds) with IVF. So we switched last month.
We were warned about multiple birth risk but nothing more than that. Do ask any questions about IUi in general though & I’ll see if I can answer.