Is this possible to be this dark....

I was due on May the 2nd come on the 4th..had my pariod stop bleeding the 10th add sex the 12th had this positive pregnancy test 31st May and about 15 more the same this dark the test line shows before the control line its that dark and quick.... My. Question is surly it can't show up. This quick?? I'm. Honestly baffled as we said we wasn't bothered about another and was avoiding the good days of that makes sense?? Could I. Be more far gone?? Could this happen and be this dark? Is this real?? I'm so. Confused it wasn't on my good days?? Also could. I be more. Far gone?? Anyone had this before??? This. Quick more far gone??