I've been consistently lifting weights and running since throughout this pregnancy since I was huge into fitness training before I got pregnant but now my max weight has been 30lbs with higher reps per my doctors orders. I read somewhere that Crossfit wasn't the best for pregnant women.
I do and its healthy for you. If your body is accustomed to lifting moderate to heavy weights I would continue until you get farther along. I just hit 18 weeks and I'm still lifting moderately-heavy. My doc says go with how your body feels. I'm sure by third trimester the weights will have to lower but you r so early on! When in doubt ask your doc!
My doctor restricted me to no more than 15 to 20 lbs since that's normal but she really stated after a certain point no more than 10. So I would talk to your doctor especially since you are still newly pregnant.