3rd attempt

Hi there.  We are on our third attempt to get pregnant. I am 35 and we have had two miscarriages.  I am only 5 weeks 4 days, so I know I am early, but they want to keep an eye on levels.  The doctor just ran my bloodwork and my hCG has only increased by 76% over 48 hours, but my progesterone levels are normal.  I am so worried after two failed attempts what this means, and honestly, that doctor will only say, "wait and see....". I realize that there isn't much else to do, but I was wondering, does anyone know of someone who had low early level hCG with normal progesterone who carried a healthy pregnancy?  I would appreciate any input.  Thank you.