Am I the only one?!

My period is expected to come tomorrow. But I took a test Saturday night which came out positive. And then I took a digital test Sunday night and it was positive. And then I took a test on Monday morning and it was positive. And I just took a test this morning and it was positive. The line is getting darker. Am I the only one that keeps testing to make sure it's still positive? I had a miscarriage March 2016 and I'm just worried that I'm gonna lose this one too. But the line is pretty dark though and I still haven't gotten to the day of my expected period. So that's a good sign right ? My last pregnancy, I didn't get a positive until a week late. And then had the miscarriage a week later.