Confused

So today my period hasn't showed. But I have been experiencing symptoms like lower back pain pelvic pain and tender boobs ! Not to mention this new pain I've experienced was sharp stomach pain... not cramping but sharp pain. This have been going on since December 19th 2016.... am I pregnant? Is it still too early to tell ? When exactly do I test ? After the whole period is threw ? I've tracked my period on here is this app accurate ? Please help !