I am 13 weeks pregnant. I had my 12 week prenatal visit last week with ultrasound and everything was fine. I was constipated earlier in the week, but yesterday went to the bathroom quite a bit. Last evening and today I have some light brown spotting (very little) with no cramping or pain. This is my first pregnancy and I am feeling a little concerned. I phoned my local clinic last night and was told it could be cervical irritation or from straining. They said there are many minor things that can cause slight spotting and unless it turned red and was heavy it was not something to worry about. I don't want to do anything wrong. I have phoned my doctor but not heard back from her. What should I do?