Neg preg test help

Je
I had a d&e 3 weeks ago yesterday. I wasn't going to take a preg test however I changed my mind last night as I will be seeing my doctor this afternoon for a my follow up. 
There is nothing showing on this test. No line at all. So now what? I tried googling it but that wasn't helpful. 
Does that mean I should get my period on time next week or no? 
What have your experiences been?
I was 17 weeks along if that makes a difference 
Thanks!

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