How big were your follicles? I ovulated really late on 50mg so they upped it to 100mg and the last two cycles I ovulated on CD16.
I think the shot she would be talking about is the HCG shot. I've never had it myself but have chatted with a lot of ladies on here who have. I'm not sure exactly how it works but somehow, by having that shot it makes you ovulate. The downside is that you could well get a lot of pregnancy symptoms from being injected with HCG, so it will nearly impossible throughout the 2WW to know if any symptoms are being caused by the shot or by being pregnant.
Generally there is a higher chance of having twins when on clomid but even if you do ovulate two eggs that doesn't mean both will make it through the fertilization/implantation process. Do you really not want to have twins or was it just your doc being concerned? I know twin pregnancies carry higher risks etc but surely you should be able to decide for yourself if you're willing to take that risk or not?