Bleeding in first trimester??

Bethany • Married, stay at home mom, expecting baby #2 April 2015.
I'm 5w pregnant, got my bfp on Friday at about 12dpo and my period was due yesterday which is when the bleeding started. Went to the ER and they confirmed that I am still pregnant, though my hcg levels are low (I had pretty low levels with dd as well) so it may actually be less than 5w. Getting checked by my OB tomorrow to make sure hcg levels are doubling, but in the mean time I am losing my mind....has anyone else experienced this?