Thoughts?! Missed period...GAH!

Hey ladies! Soooo I had my miracle on Feb 21...we were told it would never happen. Had a period around April 11th and haven't had one again...took a pregnancy test and no real line at first. Not supposed to read after 10 mins but the next day there's a truly non existent line but super ridiculously slight if you stare at it.
I'm EBF and I CANNOT be pregnant again...he has super low sperm count and I'm on the pill...but he didn't pull out once. Could it just be my hormones are all messed up? I need my period to start asap or maybe I'm just gonna miss one? Help!