How To Treat Delay In Periods?

i need help my last period date is 8 or 9 march now its april 12 i dint get it yet i m married plz i want be mother but not now how i can remove 3 or 4 week pregnancy if i am pregnant and i did home pregnancy tests three time in morning after every other day they all said negtive what should i do for relive plz help me without any future side effects i want baby in end of 2012 plz help me