I am iregular my last period was march 31 then this month of may 25 my period just stop (3 days) heavy on first day but light in next day.. possibly pregnant ?

go see a doctor if you really want to know... don't ask the internet cause not much we can do except knowing 100% from experience plus there is no way to really tell... =/ sorry

It's possible, but you would need to test to find out. Since your cycles are irregular, it could just as likely be due to that reason. If you test, and the results are negative, wait several more weeks and see if get another period or not. You could always test again at that time.

Certainly if you feel that you start to experience other possible pregnancy symptoms sooner, see your doctor.