what could it mean?

Erin

I was a week late yesterday so i took a First Response Test and it was positive. The second line was very light but it was definitely there. This morning i took a First Response digital test and it said NO. I also started spotting today but no normal symptoms of my cycle. I plan on taking a third test tomorrow, maybe a different brand. We have been trying to concieve for over 3 years now, been on the clomid and didnt concieve. Took soooo many home tests with the hope of seeing that second line and nothing. Yesterday was the first time seeing that second line... what should i do?