I am 27 years old and have pretty much had a normal period. But recently the last period I have had was on Dec. 22. The last time I had sex was on Jan. 13... I did not have any symptoms that my cycle was coming on until this month and I was spotting brown blood for like 3 days then pink for 2. A week and half after that I started spotting again and have wiped a few times to just clear mucus with red specks in it. I have take 3 home pregnancy test and all were negative. I recently went to the doctor and the urine test was negative as well. They have done a pap smear and std testing and everything was normal. I'm not sure what is going on or to think. I am having really bad back pain and am getting frustrated with no answers.