TMI!!! brown discharge 4 weeks pregnant

Wanting some help! 
Took a pregnancy test Sunday which came up positive would have been 10 dpo! Took tests every two days and lines got darker each time. 
Went for blood work Tuesday - confirmed pregnancy doctors said it was still early but numbers looked great I was 134 for hcg and 88 for progesterone. They told me to go today again to make sure numbers are doubling but when I woke up and went to the bathroom there was quite a bit of brown discharge and it hasn't stopped for the past few hours. 
Is this normal or am I starting to miscarry. 
I took another test this morning again and it was positive too. 
I'm a wreck! This is my first pregnancy let alone positive test and we were sooo excited! Feeling deviated :(