hi, I am almost 20. I have the implanon implant i got it almost 6 months ago. I was having normal monthly periods until March i did not have one at all. so far i have not had one this month either. so 7 1/2 weeks with no period. I am now feeling very weird. lower left back pain, sore left breast, nausea. alternating constipation/diarreah, bloating a lot, gas, pain between rib cage right under my breasts spreading back between my shoulder blades, lower left abdominal pain, frequent urination. but i have NO vaginal or breast discharge or anything like that. I had unprotected sex once almost 9 weeks ago but he didnt finish. and the other time only lasted 2 mins and he pulled out. what could this be??