Spotting on and off

Kristin • 27 married army 2 girls ( 3 & 8 ) expecting our 3rd and final princess. recent miscarriage (04/24) we found out our rainbow is due 02/13/18 :)
Makes no sense I have been having little discharge spotting on and off it is never bright red at all its like a brownish pink tone and its only in my cm which by the way I'm dry as the dessert! I did a beta yesterday and it looked really good its 1208 and I did a urine analysis to see if maybe its an infection. I do the second beta Wednesday. Any one else ever been in this predicament