♥.O.
Was the negative test the first test you took? Maybe you weren't far enough into the pregnancy for the test to pick up the pregnancy hormone. Were the three with the faint line prior to the one that tested postive with the darker line? Again, maybe the pregnancy hormone was barely detected by the test strip. It's not uncommon to spot during the first part of a pregnacy & I've been told it isn't that uncommon to bleed a little as well.