4th day of light brown discharge

H • First time mama to a sweet little babe due in August 2019 👶🏼

This is my 4th day having light brown discharge. It is very little, not enough for a tampon or even a pad. More so when I wipe. I had cramping on the first day it arrived, the last 3 days no cramps. My af is due to come on Wednesday. I took an early test yesterday and it was negative. What on earth is going on!!!? 🙄🙄🙄