I had intercourse on may 9, 10 and ovulated may 12 if conception occurs close to my menstruation and i did start 3 days early than when i was suppose to very light and it last 3 days can i be pregnant?

Likelihood is low: Minor variation in cycle length (+/- 2-3 days) is to some degree normal. Hormonal regulation of cycle is also being regulated by number of other factors; your mood, self perception and expectations are not the last ones on that list. As far as pregnancy to continue after period; the likelihood is very low to none. Still check yourself, and if concern persist go to see your doctor.

Yes: The light bleeding could be implantation bleeding and not your period.