when is my due date?

My last period was march 4 ,noong april 17 my pregnancy test is negative but i am not really sure after 5 mins i threw it right away but there is a line na parang blurd yong second line and then when i applied it again on april 25 yong dalawang red line is parang klaro na sya yong question ko is when is my due date, december ba or january??