Need Advice Please. Had My Last Period November 11th And

Need advice please. Had my last period November 11th and my last birth control pill November 14th. My cycles are every 25 days on the pill. I am going on 10 days late on my period and no sign of it at all. Could I be pregnant? We also have been having unprotected sex. I took a test 5 days ago and it was negative. Please help, I am so confused.