Missing periods. Or is i am pregnant?

I do n't get my periods from 2 month. my period date is 26 but in last month my period is missed and this is the second month i dont get my periods and today is 30. this never happened to me in past . My periods was always regular. I tested my pregnancy 4 times but it will be negative .due to some reasons i am very depressed i thought in first month this is the reasons of my missing periods because i didn't take meal properly and i am in my very low stage . I am always feeling very low and don't want to eat anything sometimes feel like vomet. I am confused it is because of my depression or  is i am pregnant ? I tried some home remedies to get my periods but it didn't work. Should i take any regestrone tablet to get my periods or should i take abortion pill . I don't want pregnancy but although i don't the reason of my missing periods should i go to the gynecologist.