Hcg levels?

Chris
I asked my ob for a hcg level blood work and I went yesterday and I got a 129...It was 4 weeks and 1 day of pregnancy. She wants me to repeat the test today or tomorrow... I feel fine.. No spotting.. Very tired.. Some dizzyness when moving too fast.. I can only go do the test monday. She said it was normal but in a low range.. Should I worry about it too much? I have a gut feeling that I just implanted late and everything is okay! 
What do you guys think?
UPDATE
I went back for my second blood drawn for hcg count today. No spotting, some nipple pain a times, more than normal bathroom trips than regularly... Dizzyness, insominia... Ajhhh some major hot flashes...  I am hopeful.. I cant wait to to see the number, i am hoping to get the result this afternoon.