Ttc..spotting..HELP

Shannon • Mommy to 3🎀6/9/10, 8/6/12, chemical2015 MC 9/24/2016🌈6/24/17💞unexpected baby#4 due Sept2018❤️engaged to my HS Sweetheart😍 Baby dust to all!! From Mi ✈️ Florida😍
Just looking for some feed back in confused. So I've been trying to conceive since November. I had a cycle ending on New Years. Another cycle February lasting for two weeks. According to glow my fertile window just ended feb26. Me and my fiancé literally have sex every other day. So my question is should I be panicking or is it a good thing.. Since 3/1 I've been experiencing cramping on and off and brown discharge either when I  wipe or a tiny spec in panties. Any advise or suggestions would be helpful!! Thanks..help please!