Hi Tasha,
If it is brown it is old blood. It is not unusual to have some spotting in pregnancy but it is not exactly normal either. Last time I was pregnant I think I was told that around 30% of women have some kind of spotting in the first trimester. I usually spot early in pregnancy.
You can also spot after an internal and after DTD.
It is more of a concern if the discharge turns bright red.
Hope this helps.
GIDGET.