If you are secondary, yes you can try it. But Nolvadex has antiestrogenic effect while clomid have a bit estrongenic effect. I took about 4 mg/ed just for 3 days of nolva, and my e2 crashed, but also lower my high cortisol to high low levels. But as for me taking 20mg pill could be very dangerous.
So try first clomid 12,5 mg/e2d, then make labs lh,fsh,t,e2,shbg after 4 weeks. If you will have nasty side effects of high e2 and high e2 try some AI (never used aromasin, maybe someone else could write how much take it on clomid ???) anastrazole 1mg/divide on whole week. And if you levels after 4 weeks of 12,5mg/e2d will make you unhappy. Try 12,5mg/ed.
Also read as much as you can important posts by Nelson on this site about clomid, and other guys who tried it. and don't try to big doses of any drug when you start to take it. Start from small doses.