HELP!!Reason to be worried?!

kaylee

I had Bata done last Thursday atv3w5d and they were 27, I had it done again on March 18th and it was only 152. At 4w3d. I go again in a week so at 5w3d. I guess I expected the number to be alot higher than it is....my OB said it did double every 48 hrs. And it's just a really early pregnancy....But I'm still worried about the 152. Will this be a healthy pregnancy? Has anyone cought a really early one with similar levels and it was okay?!