Well your assuming your pregnant and you have a estimated time how far along you should be so you clearly know that you might be pregnant, you need to schedule an appointment if your tests are coming out negative &you know how far along you should be. I mean c'mon their might be a baby inside you at least be responsible.
Take a test that's the only way to know, Noone here can answer that for you with certainty, only a test!
I'm just asking if it sounds like a possibility
If your scared to tell your parents , i think you should now and go to a clinic that gives free urine pregnancy tests.
How are we supposed to know if you could be pregnant or not? Take a test.