What is going on with me?

I had a miscarriage almost 4 months ago at 13 weeks. I am currently 7 weeks 2 days pregnant. We waited the two months that our doctor asked us to wait and got pregnant again right away. At around 5 weeks in my current pregnancy, I noticed a mild pain in my left side (where my ovary is). I had an ovarian cyst on my left ovary and thought it may had ruptured. I had an early scan to rule out an ectopic pregnancy and to check on the ovarian cyst. The OBGYN found a healthy pregnancy in my uterus and not in my tube. The ovarian cyst had went away on its own. 1 1/2 weeks later, I was asked to come back and we heard a heartbeat at 6 weeks 2 days. I have continued to have a pain on my left side. It lasts for about 5 seconds and then goes away, but has become more painful. I have no other pain in my lower abdomen area, just on the left side. My hcg levels were not only doubling,but tripling during weeks 5-6. I have not had another scan since my last one, but have had very strong pregnancy symptoms (moderate breast tenderness and pain, mild nausea throughout the day, and fatigue) Today, I noticed a very,very small amount of brown in my normal white discharge (the normal type that every woman has). I am not spotting brown blood, but this small amount of brown in the discharge is starting to worry me. Has anyone had this happen before? I have been referred to a High Risk Clinic and will be visiting the doctor tomrrow morning for the first time. What could that small amount of discharge be (old blood, infection, etc)? Because of the pain on my left side and the tripling of my hcg levels, could I be having a uterine pregnancy and a tubal pregnancy at the same time? .