Amy Ask any questions you like. I'm sure that between us, the ladies on this bus have pretty much been through everything!
You start to take clomid on CD2 of your cycle, (so the day after you start your full bleed) and continue until CD6. They will start you off on 50mg if it is your first time, which means 1 pill every day. People advise that you take it last thing at night, as clomid commonly causes hot and cold sweats, which can be very uncomfortable. Taking it before you go to sleep can ensure that you sleep through some of these symptoms. It will also possibly cause mood swings and irritability. On the first day of your period, you should book cd21 blood tests, which will reveal whether or not your dosage has worked. If you have ovulated, they should prescribe you a further 5 months at the same dose (so 6 months in total). If you have not ovulated, they will up your dose to 100mg, and then 150mg, which is the highest dose that I know of.
I wouldn't advise using OPKs as clomid can interfere with the result; however I always end up going against my own advice and getting false positives throughout my cycle, thus giving me false hope. I never learn... 
I think that the best and most reliable way to track ovulation is through temping. Although I've never done it, I am going to give it a go on my next clomid cycle. There are ladies on here much more experienced than me who will be able to advise you about temping. Good luck for your appointment tomorrow. Let us know how it goes 