Am I pregnant?

hi, i had unprotected sex on holiday twice. I was on the pill but didn't finish the packet so wasnt on the pill when i had sex. I've got home and been experiencing stomach cramps, orangey discharge, headaches and hot flushes. it might be in my head but my stomach feels like it's hardening?? I've taken two pregnancy tests and both negative but it's only been about a week and a half since possible conception. Is there a chance I might be pregnant?