Brown discharge at 6 weeks so just waiting......?

I had a brown discharge on Tuesday and Wednesday so I was scared and went to the doctor yesterday. I had been to him last week for my first prenatal and had a sonogram. I was 5 weeks pregnant. So I went yesterday to be sure everythign was ok. The baby has grown since last week - we saw the yolk sac this time inside of the gestational sac. I had no discharge yesterday but I have it again today. A little more than before. He told me that I need to just sit tight, relax, eat well, and keep my feet up. He wants me to come back next week. He said there really isnt anything that he can do for me. He said that the baby is growing so that is a good sign but that it does not mean I am out of the woods. He said brown discharge is about 50/50 - 50% of women that have it have no complication and 50% may. I had mild crampiong also. He said I may be having a threatened miscarriage - where you get the symptoms but nothing happens. I have not lost my pregnancy symptoms. Advice or prayers?