easy @ home users!

My two FRERs are clearly positive. Each was taken a day apart. My internet cheapies also have a line but it just doesn't seem to get any darker? I mean I'm clearly pregnant, my period is late, wouldn't the second line be as dark as the control line by now?
It makes me nervous because I expect something to go wrong with this pregnancy any moment. Maybe I should just stop taking the strips and accept the fact that I'm really pregnant?