Pregnancy is widely treated as time to stop strength training. Current evidence shows continued strength training (with modifications) through pregnancy is safe and produces better postpartum recovery. Stopping unnecessarily costs muscle mass that's hard to rebuild after birth.
What's safe to continue
Most squat, deadlift, press, row variants with adjusted weight. Bodyweight work. Walking, swimming, stationary cycling. Yoga and Pilates with modifications. Listen to body — fatigue should be moderate, not extreme.
What to modify or stop
Lying on back after 16 weeks (compresses vena cava). Heavy single-leg work in third trimester (balance issues). Anything causing pelvic pressure or instability. Contact sports. Talk with midwife if uncertain about specific exercises.
If you were training before pregnancy, continuing with sensible modifications is almost always better than stopping. Cleared by midwife at booking appointment; usually green light unless specific complications.