Ladies I really need some help

Hello everyone, I've been getting faint lines on my hpt's for about a week now. AF is due today and I'm 14dpo, so far still no sign of her but my test I took this morning has a line.. But it's not darker than yesterday's.. Do I call my doctor? If so what do I say? I had a chemical pregnancy last month and I'm a bit scared that that's going to happen again.. Really need to know whether or not I should go to my doctor.. Need some advice, anyone?