Hi
All of them are important! One test in isolation won't give enough of a picture. Also, FSH/E2 bloods need to be taken on day 2-4 of your period for accuracy.
I would also add Thyroid if you can as abnormal results are a big factor in potential implantation failure and miscarriage. You need to actually get the TSH results which MUST be between 1 and 2 for fertility. Many doctors will say your thyroid is normal at 2 and above but it is not normal for fertility.
Best of luck,
A xx