I have a very faint line all my tests done on 10, 11 and 12 dpo. This is an IUI cycle. I had a 10000iu hcg shot 1 day before IUI. Now the line did not get darker each passing day. It hasn't gotten lighter either. I have blood preg test this Friday. Any advise? Am I pregnant? Or is it it just the hcg trigger shot tricking me?