Cervical mucus was clear stretchy and fell out while wiping on 10/17. started period on 10/3 had sex on 10/14 night is it possible to become pregnant?

Conception: From the first day of menses to the next first day of menses is the cycle length. Cycle length minus 14 days is most likely time of ovulation. Ex: 28 day cycle minus 14 days equals day 14 as most likely time of ovulation. Another ex: cycle length is 30 days minus 14 days equals most likely day of ovulation of day 16. Thin watery cervical mucus is often a sign of ovulation as well.