susan123 - I did my first 2 rounds of clomid without scans or even blood tests. Then my next 2 I had blood tests and found out my progesterone was still low. I switched doctors and got the full treatment, scans etc.
In my case, we did the scans so that we could keep an eye on follicle size to see if they weren't getting big enough to give me good progesterone levels. We also had to do the scans because I was going on a higher dose of clomid and they were more nervous about the chance for multiples etc.
Scans aren't REALLY needed unless you are trying to watch for potential issues like cysts or too many follicles or even small follicles etc. I would have been just fine without the scans on my last cycle... but if my progesterone had come back low again we would have had more information to make a plan for next time. (I was getting an average of 19 on my progesterone levels using the UK measurement by the way.. thats what I mean by 'low').
Hope13 - I never had the bachache either... but I can also tell you that absolutely nothing felt different physically about my cycle when I got my BFP. The only symptoms I had showed up after I had a positive blood test and were so subtle that I wouldn't have noticed them if I didn't 'know' I was pregnant already. Its normal to have these ups and downs of hope and despair though. Just hang in there

If you need to get yourself ready for disappointment, by all means do... if you need hope restored, let us know and we will all happily cheer you on!