My lines are staying the same

Stephanie

My lines on cheap tests haven’t been getting any darker for the past 3 days. They are obvious positives and they are pretty dark but I thought eventually the test line would be as dark or darker than the control line. I thought I had one more first response test but I can’t find it and I’m freaking out because I’m cramping like AF but I know thats normal especially since it’s my first pregnancy. I wish I didn’t worry like this :( I’m 4w 4d