It would be ok to continue to lift during your pregnancy if you were already lifting, but you would need to scale back the weight and wouldn't be able to do some exercises (bench after the first trimester would be a no no, I probably wouldn't deadlift either as your belly would get in the way).

If you are already pregnant, now isn't the time to start NROLFW or other weight program. You would be better off taking some pre-natal yoga classes or swimming and walking, keeping some activity going but less impactfull and nothing too taxing.

ETA: I would lift during pregnancy, but everything would depend on how I was feeling. I would definitely scale back the weight, probably by 50%, and I would switch to more high rep/ low weight stuff just to maintain some strength with the intention of restarting a few months (3 months plus) after baby is here.