Oh all the best with it - thinking of you!

I work for one of the major clinics in Melbourne; so I do a lot of OPUs/ETs and the like. It really can depend on your own reactions, as well as how many follicles you have and eggs are collected (often if there are a large amount it can hurt a lot more; generally moreso on the second day), but regular panadol and a heatpack works for most women.

If it gets any worse than that, you should be calling the IVF nurses and talk over it with them.