How long do I need to wait for different fertility treatments?

We had set a date to start IVF #3 in July but with everything going on I don't know if the clinic is going to push it back. I was given the option to try clomid for 3 months before making the decision to try IVF again. I had choosen not to try clomid and jump straight to IVF. Now I'm contemplating trying clomid but don't know if that would push our IVF cycle if we are given the okay to move forward in July. How long do I need to wait between clomid and IVF ? Is it better to take a break between cycles? If so, what is the time I should wait between both fertility treatments?