I recently went to see my GP for a referral to a FS and he suggested getting some bloods done before I go (have had bloods done last year and they came back fine, of course things may have changed).
Problem is he was pretty vague re tests so I asked is there a specific day in my cycle I should get BT? Having heard of the day 21 test? He said probably better in the 2nd half of your cycle and maybe day 18 would be better than day 21 given my last 4 cycles have been 25 days... (I hate vague instruction!). So I just got the BT on day 18 as told, results tomorrow.
So I started BBT this month also and it looks like I O'd on day 17 (OPK also looked promising on day 16). If this is true, would a day 18 BT be inaccurate?? ie progesterone etc?