question! a little TMI also

so I took a first response test yesterday and it automatically showed 2 lines. After the 2 minutes the line that says your pregnant was way darker then the other line. last month my period was two weeks late and at that it was odd. I bleed a lot more then my normal but there was no clots. which are very common for me and a good amount each month. I'm late again but by 4 days now. I finally got a pregnancy test. they are so expensive! of course it was positive but dang that line was DARK!