Brown :(

I have brown spotting and I have off and on since I was 3-4 weeks. I am 6w3days today. Some days I have barely anything and others I have a little more (when I wipe) and a little teeny bit on my panty liner... I’ve read it’s normal.. I’ve had very little to no cramping... no morning sickness (only the occasional nausea and then when I eat dry food I’m fine again) and sore nipples on and off. How long does the brown spotting last? Or brown discharge? Whatever it is..... can it last weeks and weeks or is it only first trimester. Thanks!