Pink/Brown discharge: 4w5d

According to my LMP I am currently 4w5d pregnant. This even I went to use the restroom and when I wiped I had brownish/pink discharge. I have taken 7 pregnancy tests including a digital which all came back positive. I am so worried that something is wrong. Is this normal? I've heard cramping like AF is normal this early which I am having as well but nothing about discharge. Help please!