Fertility bloodwork/tests

Back story...

Had paragaurd IUD removed in November. Got pregnant end of March had a chemical early April. Continued TTC, no luck.

June I did my first round of clomid. Did day 21 progesterone level was 14.6. doctor didn't say if it was good or bad. I don't think it worked. I can feel my period coming, and multiple negative pregnancy tests.

So my doctor wants to do a couple more rounds of clomid. I would prefer to do more tests rather then take drugs and there be something wrong.

So the question is what bloodwork/procedures/test do you think I should get done next.

*I have an appointment at a new doctor next month