It's been a long day...just reading my post. I meant "try NOT to worry".
I've only been pregnant once and it ended in a m/c. But, I was told it is normal to bleed during pregnancy. You should watch for heavy bleeding and bad cramps. Your numbers are supposed to double every 48 hours. So, depending on when you had your numbers tested, the rise is a good sign. If the doctor didn't raise any concerns with the bleeding then I would try to worry. I wish you a happy & healthy 9 months...