I have a 40 day cycle... and i recently did a ultrasound and found a beautiful follicle growing on day 12 of my cycle.... when is the best time to concieve?

Ovulation occurs: ...when the follicle is at least 18 mm and up to 24mm. Your Gyn can give you a close approximation & more advice. If the follicle is still growing, your best bet is to have sex daily until a day or so after ovulation. Ovulation predictor kits can detect the LH hormone surge that occurs shortly before ovulation. Also, cervical mucus becomes clear & stretchy near ovulation. Hope this helps!

Varies: but within a week of a dominant follicle. anywhere from wtihin 1-2 days to a week. trying about every 3 days good luck