Pregnancy question

I am just wondering i am 6 weeks 3 day I took a pregnancy test just to take it and the test line appeared instantly but the test line is darker then the control line is that normal i know the baby is in my uterus I have already had an ultrasound but I had a ectopic pregnancy in 2014 so I am just little scared I want everything to be okay I guess when I hear the heartbeat on Feb 9 I will be like okay I am pregnant this is my little miracle baby it's meant to be!!! Thanks for the advice