Tests

Fellow mamas. I am addicted to taking tests. I had a MC back in March and it just makes me feel better to keep seeing that positive line. Anyway,my question is,does the darkness of the line depend on what time of day you test? For example I tested at 11am one morning and had a super dark line. I tested again at 8.30pm in the evening a few nights later and got a instant positive result but the line wasn't as dark? Does the time depend on how dark the line will be? Also these where cheap tests.