I agree with the other ladies. Discharge of varying colors can be normal during pregnancy, as can a little brown discharge which as adgal said can be caused by several things including sex.
That said, do call your doctor on Monday to let them know. Your doctor may want you to come in for an examination to make sure something else isnt going on (infection, for example).
Brownish can mean a bit of blood mixed in with the mucus. That too is nothing to panic about as your cervix is very easily irritated right now. It can happen even from intercourse amongst other things. I understand your worry as I have a history of m/c as well. I honestly would give yourself peace of mind and give your Dr. a call on monday.
I'm trying not to be worried. Just used the bathroom and the discharge is now more brownish in color.
I was curious about the yellowish discharge too. I have an appt with my high risk doc on Tues, so will double check, but my ob said it was normal when I mentioned it to her a month ago. I can imagine you're nervous given your past m/c. It does sound like everything's normal, but I agree. Run it by your doc. That'll give you some peace of mind :) Best wishes!!!
All of it sounds normal to me. My discharge in the first and second trimesters varied from white to yellow to even orange a few times. I wondered if I might have an infection, but everything was fine. As for the cramping, that too comes with the territory. Your body is going through all kinds of changes right now, including stretching out to make room for baby. However, it is never a bad idea to run things past your OB. If you have an appointment coming up, I would mention it then. If not, I would give him/her a call. I'm sure all is fine though. Good luck!