I'm a girl, 5ft, 150 lbs. been working out for 2 months, 3x/day with weights & 45 min cardio. also reduced cal intake to 1200/day. why no weight lose?

Check thyroid: Check thyroid and glucose levels. Make sure you are accurately tracking calories (alcohol counts too) and please make changes you can sustain. I substituted my normal diner lunch with a health choice or kashi meal with half hour day on elliptical. Lost 30lbs and maintained for 2 years. Gained some and realized this was my new normal. Keep at it and you will succeed. Just do something maintainable.

Muscle building: You may be building muscle and losing fat with a net of zero weight loss. Pay attention to your body shape and muscle toning. For many, a drop in waist size or clothing sizes can represent a healthy change in body habitus, even without a change on the scale. However, if are not seeing these improvements, then consultation with a sports medicine or primary care physician would be wise.