here is a link to a slideshow about fertility and ovulation that i think you'll find very helpful. it states: "while the exact timing of ovulation can vary on average it happens between day 11 and 21 of your cycle. a brain hormone called luteinizing hormone (lh) surges triggering the release of the egg that's most ripe. at the same time your cervical mucus changes to a slippery egg-white consistency to help sperm make their way to the egg. " so there is a chance that you could be pregnant if your ovulation cycle fits this pattern. the webmd answers staff
me and my boyfriend had sex early friday morning on my 18th cycle day. will there be a chance i will become pregnant?