If you are on birth control pills and have regular cycles, the blood tests are still between day 2-4 of your cycle. If you are on pills and don’t have a regular period, it should be scheduled 4-5 days after the last active pill.
If you use a birth control patch, the blood tests are drawn 4-5 days after taking off the patch and before putting on a new one.
If you use the Nuvaring, the blood tests are drawn 4-5 days after taking out the ring and before inserting a new one.
The Copper IUD is fine for testing. If you have a Mirena IUD, you can have testing but only AMH levels (see question below).
Women with a Hormonal Rod Implant or on DepoProvera are not candidates.