Hey everyone so I am sexually active and me and my boyfriend use protection but I am 23 days late on my period five home pregnant tests done all negative and one test done at the doctors office also negative I have been taking b12 shots which I started two days after my last period they also gave me a water pill and phentromine the doctor said it was normal to be late because of the medicine but I am extremely late and it worries him. I have no pregnancy symptoms at all except for the last two weeks I have had a temp of 100 but I am not sick and I have been have headaches and s little back pain. PLEASE HELP!