Still Not Sure.. Please Help I Need to Know..

I think maybe 2 weeks ago I posted about me not having a period and unprotected and all these different symptoms: sore and tender breasts, freaquent urination, craving different foods, eating a lot, bad headaches, and I feel and it looks as if my stomach is getting better.. I recently got off birth control pills and took 2 pregnancy tests and they both came back negative... Is there still of chance of me being pregnant?? Im only 17 and don't know how to tell my parents...