I had heavy blood one time during the day and then it went away next day same thing happend except not heavy and today i had nothing, could i be prgnt?

More info needed: Did you have unprotected sex near the time of ovulation? Is this the expected time for your period? Have you never had an unusually light/short period? In any case, have an exam - include a pregnancy test if it's a possibility and move ahead from there w/ plans. Also ask for good information on the issue of reproduction and safety. It'll make you feel better.