Im 15 years of age, I had unprotected sex with my ex on the 29th oct, I've not had my period for two months now, and I'm confused? On the strip tests come back pos but the digital and doctors tests come back negative? Can someone help?

Digital and docs might not be as sensitive.  Urine tests have different sensitivity.  

What did your doc suggest? 

I I would buy some cheap tests and test every couple of days or so until I got some form of answer, you can buy like 50 strips from eBay for £3-4 if still nothing go back to doctors