First appointment! Saw heart beat!

So we had our first appointment today!! Saw the little heart fluttering! Thought I was 6 weeks and 5 days but measuring 6 weeks and 2 days... Doctor isn't concerned because it's just a couple of days and I may have ovulated later than expected! I don't go back now til March 12th!! Next 4 weeks are going to be the worst!! I'm so happy we saw the heart beat but I'm still so nervous because it's still early! Please pray that my little rainbow baby sticks with us and continues to grow and grow! Doctor doesn't seem concerned but I am!