I hate to sound negative but I think that you also need to know that bleeding may be normal, sometimes you can even still get your period but I have had 3 miscarriages this year. The first sign for all of them was spotting. I would ask your doctor to do an US. after 6weeks your suppose to be able to hear a heart beat. Also have you HCG levels checked. If they go up you are still pregnant, if they go down you are most likely going to have a miscarriage.
If you do have a miscarriage, I would reccomend having it natural. Yes it is painful but it is better than a D&C. If you have a D&C, it leaves scarring and can create more issues for any future pregnancy
I had bleeding during my first trimester too. I was worried but I had an ultrasound and the baby was fine. I even passed blood clots! My tracker shows the bleeding I had early on. Don't worry. Just relax like your doctor said. For the rest of my first trimester I rested every chance I got and put myself on a mini bed rest every weekend. I am 15 weeks today. I hope you have a happy and healthy 9 months.