The jadelle implant

I am 19 years old, had the jadelle implant in 2012 got it taken out jan 2014 because it was effecting my body in a bad way. Had my first period in feb 26th exact time it should come, normal period for me. Been having unprotected sex after my period stopped. Now I'm 16 days late, taken pregnancy home test twice, blood test as well all three came back negitive. But I have got sore boobs, craving for different foods, feeling sick on and off during the day. Bloated and getting headaches all the time, feel tired more then usual. What's going on with my body ? Please help!!