Hello doctor, I have a question for you: I was about 2 weeks late for my period, then I had back pain, dull abdominal pain, and chest pain. I took a pregnancy test and it showed 2 lines. After that, I went to the doctor and he said he didn't see any fetus in the uterus but the lining was thick, so the fetus was preparing to implant. He asked me to come back for a check-up in 1 week, but after about 2 days at home, I had some brown bleeding and the next day I had more bleeding.