I am so afraid. Brown discharge

Chante
I am 4 weeks pregnant now, and last night I had brown discharge. I was supposed to start my period yesterday so this scared me to no other. I cried thinking something bad was happening . But the discharge was watery and only when I wipe. I'm trying to stay positive . I took a pregnancy test again this morning at it came it darker than the one I took a few days ago. I really hope my baby is okay , and that this is normal. It kills me that I have to wait to go to my doctor to make sure everything is fine. Please tell me if this is normal