Blood Tests...

Hi Ladies! Just wondering if anyone can help me...! My GP has agreed to do some initial bloods (TTC #3 for 11 months) Question is would midway through cycle (around ovulation) bloods or Day 21 bloods (after ovulation) be more informative. He didn't really say...just told me to book in with the nurse for LH, FSH, Thyroid and a few other...of which I can't remember...x