Can't help but worry... Any positive stories out there???

So I found out Monday that I'm expecting. This is my 3rd pregnancy. I have a happy healthy and wild 21 month old and miscarried back in November. I went in yesterday to have blood work done given my history and my hcg came back "low" today. It's 126. I initially thought the first day of my LMP was Jan 20 which would put me (by glow standards) at 4 weeks as of yesterday. The nurse said that this is low but everything I'm reading on line tells me otherwise. I also looked at it as 14 DPO and found that my number seemed to be ok too. Any thoughts ladies? Could really use some encouragement. I go back tomorrow for round 2 but will have to wait til Monday for results... Ugh