Help!

As

So my progesterone was only like a 15 but my doctor put me on some meds a week ago. This is my 3rd pregnancy and I have had 2 previous miscarriages so I'm already anxious about everything but I was wondering if brown discharge is normal? I've had cramping but it's strictly on the left side of my abdomen and back. The nurse I talked to also said that the progesterone pill could cause a different colored discharge (the pill I take is pink), just wondering if this is normal or if someone else has experienced this?