OMG, I think Santa gave me my Christmas present..possible BFP?

Girls, I was supposed to start Sunday. Well, here it is Tuesday (2 days late for AF). For the past week, I've been feeling tugging sensation in lower stomach, my over the weekend started to feel hard and firm up and really sore. I thought maybe it's stress why I didn't get Aunt Flow because I don't have the extra cervical mucus. As a matter of fact, I feel really dry for the past week down there. Well, I just went to the dollar tree and got one of those dip stick tests. I went home for lunch and took it and there appeared to be a very faint second line. I held it up to the window and light and after about 10 minutes when it started to dry some, the line appeared a little more clear. It is still positive and I am a little worried it is an evaporation line or something. But I'm gonna test again tomorrow morning and see what it does, and get a different brand to take over the weekend if aunt flow doesn't show up. I pray this is it!! I hope I got my Christmas wish. What are your experiences with these types of tests and what do you think the chances of it being an evaporation. I'm so on edge until I know for sure. I can't go to the doctor until January when my insurance kicks in to be checked, so I have to go by these home tests for now.