Help put my mind at ease...please...

Taylor • Wife • Mama to Emersyn + Lennon 💕

I am currently 6w4d according to my LMP. I am one of those who have constantly take tests....so Wednesday I took a test and got a very positive test. Yesterday I had some minor cramps and a very tiny amount of brown discharge/spotting. Today I took another test and it was lighter than the test I took on Wednesday. Is that a sign that I am miscarrying or does the line not necessarily determine hcg levels? Thank you in advance...