Severe lower abdominal cramping

Im 37 weeks and 4 days along. A few hours ago I was experiencing severe lower abdominal cramping, it would come on very strong and last a minute or two and then go away this happened a few times and then stopped, I didn't think much of it until I went to the bathroom recently and noticed that there was brown discharge and there were what looked like small, dry very dark red blood clots. There were a few of them. I also noticed the baby's movement has slowed down. Which normally dosnt worry me because he has down times too but now I'm worried there may be something wrong. Does anyone know if this is normal or not?