should I be concerned

Shannon-Shera • Mommy to 4🎀6/9/10, 8/6/12, chemical2015 MC 9/24/2016🌈6/24/17💞unexpected baby#4 9/17/18❤️engaged to my HS Sweetheart😍 Baby dust to all!! From Mi ✈️ Florida😍
So I'm close to 5 weeks and when I got back from taking my trash out (a little heavy fiancé said he would but I was already in the process lol) and cleaning etc I came inside to use the bathroom and had some brown in my undies..it has me a little nervous. Should I be? Or is it kind of normal? Never noticed with my other pregnancies my girls are 6&4 so it's been a while. Anything helps. T.I.A☺️