Panicked mom here

So with my first daughter I never lost weight had morning sickness to boot and not a spot of bleeding, this pregnancy is killing me! I am completely exhausted lately, haven’t really been sick but am still losing weight I started at 190 I am 179 now and yesterday I got some dark brown discharge it wasn’t a lot but I wouldn’t say just spotting I haven’t had cramps and I did move to my new house so I was very active the day before but it’s making me panic am I okay or should I call my doctor? Is this Normal ya have the dark brown at 12 weeks 3 days

Help a nervous momma out ladies!