Spotting in the second trimester

Is it normal to spot light amount of brown blood? When I mean lights it’s very very little. It’s always random and it’s a random thin brown blood. No cramping or pressure. It comes and goes every couple of days or sometimes it can be two days back to back one time in a day. I’am 12 weeks pregnant almost 13 weeks pregnant. I haven’t have had sex either in the times I spot.