Should I be freaking out????

So I'm 5 weeks and 7 days pregnant and yesterday I saw brownish coloured discharge and today I saw the same but now I saw dark red and for the 8th time I used the bathroom I saw a small clump of dark red mixed with a little light red. I've had cramping and lower back pain on and off and breast still hurt. Now using the bathroom again its brownish what's going on ??