positive?

Karel
I'm a 30-32 days cycle starts from Nov.18. My fertile window according to this app is Nov.31 - Dec. 6
But there was a blob of ewcm on Nov. 28 and we BD that night , Nov 31, Dec. 1, 5, & 6 
I tested yesterday and it was totally N but today I just wanted to give it a try again and it has a very light line. I wonder if I just used the PT wrong since I always do it using clean paper cup and dip but today I peed on it and my pee was kinda on and off. I will try it again later but I just wanna know if this could be a sign of a positive result. Thanks