Trying to remain calm

Olivia • Had our son in April 2016 😍
I have only known we are pregnant for a few days. I keep taking tests and comparing lines (doctor's urine test already confirmed I am pregnant) and am so scared this won't stick. I don't feel pregnant yet and I think that is contributing to my fears that isn't really happening. What is wrong with me? Yesterday I was so happy and this morning I am so scared. 
Anyone else newly pregnant and worried it will be taken from you? How do I reassure myself? I should probably stop taking tests, 7 positives is enough already and obsessing over if the lines are darker isn't helping.