So, long story... Well I'm on progesterone to help me have periods on a normal schedule. My gyn said the first month it would take up to two weeks to to start. Well my body was an over achiever and started 2 days after starting. Fast forward to after 3 months on. Had my medication induced period then tried to baby dance around my supposed fertility/ovulation days. Then on October 11th I started like clock work ended the 15th night. Then all the sudden last night the 16th around 8pm I started to have really bad back pain an cramping. I bled a little then it dissipated and nothing till I came back to work and after about an hour more back pain no bleeding... I took pregnancy test with no luck yesterday morning. Should I take another today? Do I need to be worried? Just really nervous...