Yess, my control line was just like that. I took a clearblue test first & it came up positive almost immediately, and a few hours later i took a First Response and it came up just like that.. The test line is SOOO dark, and the control line is very very faint, take a look.. Cause i was wondering the same, & my first doctor appointment isnt until monday so i have 6 more days of impatiently going crazy lol Im sure everyone understands what i mean.
https://i52.tinypic.com/250ouq9.jpg